So you are thinking about building an AR style rifle, but are not too crazy about the standard cartridge of the AR-15: the 5.56NATO/.223 Rem. Instead, something with a little more power and range is in your sights. The AR platform lends itself as well to both accuracy and performance as it does to modularity. Able to have different furniture and parts, it is capable of accepting a variety of cartridges like the .308 winchester. The model of AR style that fits these larger, more powerful cartridges is called the AR-10, or .308 rifle. It involves a bigger frame and  bolt, but still utilizes the same trigger components, grip style, and stock style. 

What is an AR-10?

The AR-10 comes from the original designs for the AR platform under Eugene Stoner. The main NATO cartridge which arose after World War II and the Korean War became the 7.62×51 NATO. This  cartridge was modeled exclusively after the .308 Winchester, a common American hunting cartridge that was suitable for use in war. Some of Stoner’s first ideas for the AR platform would incorporate the 7.62×51 NATO, which would have successfully made his model firearm suitable for other military contracts with other NATO affiliated countries. 

During Colt’s possession of Armalites patents, not much of the AR-10 was seen apart from various designs used for law enforcement agencies across the US. The hobby of building them did not reach popularity until the designs for the AR platform became available to the public. The development of the AR-10 platform in the civilian market skyrocketed, opening up the door for different specifications to make it more suitable for civilian use. Whether for hunting, performance shooting, or self defense, the AR-10 is a great and affordable choice for any and all shooters. 

What calibers are available for the AR-10?

Since the AR-10 has a solid place in the aftermarket, there are also different chamberings for the model. This is pretty typical for the AR platform  as the AR-15 and AR-9s both have modified barrels for different calibers as well. Think of it like this: The AR-10 has a much bigger build, because it is made to take calibers longer than the .223/5.56. 

The AR-15 could never chamber the .308 because, lengthwise, the cartridge is too long for the system. The AR-10 solves this issue with a lengthened bolt system that is also capable of housing calibers of larger length measurements. So while the .308 is a perfect fit for the AR-10, it will not be able to hold calibers longer than it like the .30-06, another popular hunting cartridge. 

4 Main Calibers for the AR-10

There are 4 main AR 10 Calibers.

6.5 Creedmoor AR-10

6.5 Creedmoor is essentially a .308 if it were 1mm smaller in diameter with just a tad more gunpowder in its casing. The 6.5 Creedmoor is a relatively new cartridge, becoming famous alongside the AR-10 in the late 2010s. It has a slightly higher ballistic capacity than the .308 Winchester, so it is able to squeeze out a higher muzzle velocity with around 200 yards more range. 

6.5 Grendel AR-10

The 6.5 Grendel has the same diameter as the Creedmoor, but is much like the .300 AAC blackout if the .300 blackout was a magnum cartridge. This short and stubby round has a much longer projectile length, increasing its mass to produce a higher force of impact at the reduction of some speed and range. 

.308 Winchester AR-10

 The .308 Winchester is not the original cartridge of the AR-10, but it is the most commonly used cartridge with the platform. Having a long history as one of America’s favorite hunting cartridges, the .308 Winchester has a solid place as the standard for decent hunting cartridges. 

7.62×51 NATO AR-10

The 7.62×51 NATO is the original cartridge the AR-10 was designed around. This military cartridge has a slightly higher capability than the .308 Winchester, but they are essentially the same bullet. NATO created this caliber from the commercial .308 Winchester in an attempt to standardize the cartridge for all NATO forces. That is why the NATO cartridge uses the mm measurement as opposed to the caliber measurement of the .308 Winchester. 

AR-10 vs AR-15

When it comes to the ballistic capabilities of the AR-10, there is no comparison. The AR-10 is designed to shoot cartridges with much higher ballistic ratings while using the exact same platform as the AR-15. Essentially, the AR-10 is a much stockier AR-15. The design of the AR-10 is the exact same as the AR-15, so the only difference between the two are the weight, and the caliber range. 

The AR-10 does require a little bit more confidence when firing, which is not necessarily a bad thing compared to the AR-15. The AR-10 shoots ammunition that is usually too expensive to shoot around all the time, thus making it even better for hunting purposes. The increased range, speed, and force of impact of the AR-10 also helps in this situation. 

What parts are needed to build an AR-10?

The AR-10, like the others in the AR family, are made of two main components that each house core parts of the AR-10s function. The AR-10 is a simply built rifle, so many of these parts can be placed in and fastened with pins. Here are all the parts needed to build an AR-10

AR-10 Upper

The AR-10 upper contains the necessary parts in order to cycle the action. It utilizes a gas system which uses a small portion of the expanding gasses to push the bolt back, creating the semi-automatic function of the gun. Here are the main parts of the AR-10 upper:

AR-10 Upper receiver: The AR-10 upper receiver is the upper portion of the receiver which acts as the housing unit for all of the upper parts. The upper receiver connects the barrel while housing the bolt and charging handle.

AR-10 BCG: The Bcg for an AR-10 is much like the AR-15, except the diameter is much bigger. The carrier is als much bulkier as it needs more weight in order to reduce the recoil of the ammunition its shooting. The AR-10 made the nickel boron finish famous in the aftermarket and is the most sought-after bolt finish for the AR-10.

The AR-10 Charging Handle: In the case of the AR-10 charging handle, it resembles the AR-15 charging handle exactly, if a little longer, to accommodate the length of the enhanced bolt carrier group. Ambidextrous versions of these charging handles can be purchased at many of the AR-10 parts stores on the internet. Otherwise, the standard AR-10 charging handle is made to mil spec standards. 

The AR-10 Barrel: The barrel of the AR-10 is based on the free float system, meaning that its only point of contact with the rest of the gun is at its chamber. It is locked tight with a barrel nut that must be securely fastened to a certain torque measurement. The only other thing connected to the barrel is the gas block.

The AR-10 Gas Block: The gas block is the part of the AR-10 that connects the gas tube to the barrel. On the barrel is a small cavity where the gas block must be connected to. Adjustable gas blocks can be purchased for calibers designed for use with suppressors. 

The AR-10 Gas tube:   The gas tube is a thin bored tube that carries the expanding gas of the fired cartridge to the gas key which is fastened to the AR-10 bolt carrier group. The expanding gasses push the bolt back to eject the cartridge. 

Muzzle Devices: There are a series of muzzle devices that are great for the AR-10. Because it is a hunting rifle, the most useful muzzle device would be either a flash hider or a suppressor. However, compensators and muzzle brakes are also viable options for this full length rifle. 

AR-10 Handguard: Since the AR-10 is based off of a free float system, its handguard never comes into contact with the barrel itself. There are AR-10 keymod rail mount hanguards, as well as the newer M LOK handguard. Both have their advantages. The keymod rail system is much more user friendly, while the M LOK system is much better at securing attachments for longer periods of time. 

The AR-10 Lower

The AR 10 Lower houses all of the lower components. It provides the grip, as well as the connection to the buffer system which holds the adjustable buttstock. This portion of the AR-10 is responsible for the firing of the gun. The upper works hand in hand with these functions in order to create the semiautomatic system the gun is known for.

The AR-10 Lower:  The AR-10 lower is the housing component for all of the lower parts. It is responsible for connecting these parts to the parts of the upper so that the system can work in its entirety. The are different lowers, like AR-10 80% lowers and polymer lowers that from which the gun can be built from scratch.

The AR-10 Trigger group:  The trigger group fits into a cavity in the lower receiver. If the lower is 80% lower, this cavity must be milled out in order for the trigger group to be installed. In the trigger group are the trigger, hammer, bolt catch, trigger guard, magazine release, and grip. 

AR-10 Grip: The AR-10 grip is the exact same grip as the AR-15. The standard grip resembles the mil spec grip for the AR platform, but can be modified and upgraded for a fairly cheap price. The most popular AR-10 grip is the Magpul MOE, which has stippling great for an ergonomic grip. 

The AR-10 Buffer System:   The buffer’s chief responsibility is to provide the necessary spring force to push the bolt back into the battery after a round has been fired. It does this with the help of a weighted implement called a buffer that works together with a spring that also reduces the amount of recoil. There are buffers with different weights that change the effectiveness of this process.

The AR-10 Buttstock:  The buttstock of an AR-10 is much like the AR-15 and in many cases, they are also interchangeable. The buttstock is connected to the buffer tube, which houses the buffer and buffer spring. 

Necessary tools to build a .308 Lower

While tools are necessary, ones specifically catered to the building of AR style firearms are not. In fact, the whole build can be assembled with common household tools. The most necessary tool for the building of a .308 lower is a roll pin punch set, as most of the components are fastened via roll pins. This will make disassembly a lot more convenient as well. 

For the sake of convenience, looking into an armorer’s wrench may be a good idea. Armorer’s wrenches are multi-functional tools designed for many of the components of an AR platform firearm. They came traditionally with a castle nut wrench, a barrel nut wrench and a few other components that will make the assembly/reassembly process a lot easier. 

For now, jig kits will still be necessary to machine 80 lowers. And if you still plan on buying an incomplete receiver, then buying the proper jig kit will be crucial to an accurately built rifle. 

Do you need a .308 lower?

The hobby of gun building in the civilian market will be taking a drastic turn come August 24th as it is the effective date of the ATF Final Ruling 2021r-05f which effectively bans the use of 80% lowers by civilians.  This does not mean that building a .308 rifle will be impossible, it just means that buying an 80% will only be legal if the lower itself and the associated upper are serialized by an ATF authorized marker. 

Fortunately, the process of building a .308 rifle will remain relatively the same minus the clear infringement of the second amendment. The process will be closer to building a rifle from a completed lower, which means  that milling the lower out is no longer necessary. Instead the fire control group will simply need to be installed if it hasn’t come preassembled. The rest of the components have always been easily interchangeable, so most of the process will remain the same. 

Conclusion

Building a .308 Rifle is great for a myriad of reasons. It gives you  more insight to the nature of the components as well as providing an easy outlet for later modifications. The knowledge of the parts and how to assemble them is very important for later modifications. 

Building a .308 rifle is as easy as building an AR-15, because they are essentially the same build. The AR-15 is simply a smaller version of the AR-10. It utilizes the .308 winchester/7.62×51 NATO cartridge. The barrel can be modified for the addition of different calibers as well. 

Building an AR-10 keeps you in control of the quality of every part whereas a purchased build could have parts of varying qualities. It simply reduces the chance for error that faulty parts might get you by putting the acquisition of parts in your hands instead of in someone else’s. This also may have a hand in making the overall build much cheaper in the long run. 

The AR-10 is a great rifle. It can be used for hunting, competition shooting and self defense, however, not in the home. It brings the AR platform to the full length rifle atmosphere and does not disappoint because of the AR platform’s already great attributes. It is easily modifiable, accurate, and lightweight compared to other full length rifles. Buying an AR-10 is as easy as setting up a reasonable budget for materials and accessories, and then checking out. 

REMINGTON R10 .308 WIN/7.62 SEMI-AUTOMATIC AR-10 RIFLE – 86361

7.62mm carbine design, re-engineered from the bolt group to the buttstock to deliver 7.62mm knock-down power with the handling characteristics and similar outside dimensions of a 5.56mm AR carbine. The R10’s hammer-forged, sniper-grade barrel features 5R rifling for added precision and an effective range out to 800 m. All R10s have fully ambidextrous controls and free floated modular Remington Arms Handguards (RAHG) (coming soon in M-LOK). As the standard 7.62mm duty carbine of the US Drug Enforcement Administration and the Federal Bureau of Investigation, the R10 firearm system is sure to meet your needs as well.

#1. DD5^®V5^® (6.5 CREEDMOOR)

The DD5 V5, chambered in either 6.5 Creedmoor or .260 Rem., provides users of the Daniel Defense semi-automatic platform even greater long-range precision shooting capability by featuring two of the top short action cartridges available for today’s modern long range shooters. Both the .260 Rem. and the 6.5 Creedmoor take advantage of superior ballistic coefficients to offer both flatter trajectories and reduced wind drift at levels normally reserved for much heavier recoiling long action calibers. These gains in ballistic efficiency help the modern shooter stretch the effective range out to 1,000 meters or more. This highly accurate and durable rifle includes an adjustable gas block that allows for a consistent feel whether shooting suppressed or unsuppressed. The perfected bolt carrier group reduces overall recoil impulse and is easy to maintain and operate in all conditions.

#2. DD5^®V4^® (7.62 X 51MM)

The DD5 V4, chambered in either 6.5 Creedmoor or 7.62x51mm NATO, provides users of the Daniel Defense semi-automatic platform even greater long-range precision shooting capability. The highly popular 6.5 Creedmoor takes advantage of superior ballistic coefficients to offer both flatter trajectories and reduced wind drift at levels normally reserved for much heavier recoiling long action calibers. These gains in ballistic efficiency help the modern shooter stretch the effective range out to 1,000 meters or more. This highly accurate and durable rifle includes an adjustable gas block that allows for a consistent feel whether shooting suppressed or unsuppressed. The perfected bolt carrier group reduces overall recoil impulse and is easy to maintain and operate in all conditions.

#3. DD5^®V3^® (7.62 X 51MM)

The DD5 V3 builds upon the foundation Daniel Defense established in 7.62 AR-style rifles. This highly accurate and durable rifle includes an adjustable gas block that allows for a consistent feel whether shooting suppressed or unsuppressed. The perfected bolt carrier group reduces overall recoil impulse and is easy to maintain and operate in all conditions. Designed around a Cold Hammer Forged barrel with an innovative 4-Bolt Connection System, this design dramatically increases the connection surface area between the barrel and upper receiver for increased rigidity/stability to wring out accuracy traditionally only found in high-end bolt action rifles. The DD5 platforms have upgraded controls like ambi bolt catch, magazine release, safety selector and Daniel Defense enhanced furniture. The DD5 V3 sets a new benchmark in performance for 7.62 AR-style rifles.

#1. Hexmag AR-10A/LR-308/SR-25 Pattern Magazine .308 Winchester 20 Rounds Polymer Black HX20SR25S1BLK

Hexmag magazines are made from durable, lightweight polymer material and are designed to function perfectly in most AR-10 Series A, DPMS LR-308 or SR25 compatible rifles. They feature a raised hexagon pattern for superior grip and secure handling, a USGI spec stainless steel spring and an anti-tilt follower. The tool-free latch plate design makes disassembly fast and easy. The Hexmag HexID color identification system makes ammo recognition simple.

#2. Luth-AR LR-308/AR-10 MBA-1 Stock Assembly A2 Tube .308 Rifle Buffer And Spring Black

The LUTH-AR MBA-1 Rifle Buttstock is the perfect stock for any long range, large frame AR build. The cheek rest and length of pull are adjustable, and the stock is made from durable and strong glass-filled nylon, all while weighing in at a svelte 1.26 pounds. If you are modifying your 6.5 CM LR-308 for gas gun precision or building an AR-10 battle rifle for DMR duty, this LUTH-AR MBA-1 kit is perfect for your rifle.

LUTH-AR offers replacement components for the AR-15 that are made to strict military specifications. These high quality components will provide excellent fit and reliable function in your AR series rifle and are perfect for upgrading existing components or replacing worn or broken parts.

This package includes:

• > | MBA-1 Modular Buttstock Assembly
• > | .308 Rifle Receiver Extension Buffer Tube
• > | Standard .308 Buttstock Buffer Spring
• > | Standard Buffer Body Assembly

#3. XAegis Brass Catcher, Universal Shell Catcher Net with Picatinny Rail Mount Heat Resistant Mesh Brass Collection for Rifle Range (Brass Catcher with ONE pic Rail Mount)

Universal AR Brass Catcher Shell Catcher Net with Picatinny Rail Mount. Not to spend all that time cleaning up on range day. It attaches very easily and securely but pops right off when it is time to empty the bag.

#4. Magpul Bipod for Hunting and Shooting

Made of lightweight Mil-Spec hard anodized 6061 T-6 aluminum and Injection-molded polymer; Aesthetically pleasing, low-profile design conceals its mechanisms and hardware, smoothly brushing off snags and bumps.

Optimized for rapid one-handed adjustments; quickly and quietly transitions between countless user configurations.

Easily loaded with stabilizing forward tension without fear of failure or warping; At just over 11 ounces, the Magpul bipod is lighter than many pricier bipods currently on the market.

Spring-tension legs stow neatly forward and snap down and lock into place with one hand; Leg extensions slide and lock securely with the push of a button on any of the seven half-inch spaced locking detents.

An industry-exclusive 50 degrees of total tilt and 40 degrees of total pan are controlled by a glove-friendly knurled tool-less bipod locking knob located between the extended legs, allowing easy adjustment between shots.

#5. Pinty Rifle Scope 4-16X50 Illuminated Optics Sight Green Laser, Reflex Holographic Dot Sight, Riser Mount 14 Slots 1 inch High Riser Mount

2 separate buttons to adjust the 9 brightness levels for both green & red illuminated dot sight with 4 reticle patterns. Detachable green laser w/ independent switch can reach distance about 100m (110 yards), provides high accuracy for hunting & shooting. Boasting 4x-16x magnification, this optics is well suited for wide range shooting, perfect for quick acquisition of close quarter & fast moving targets. 14 slots riser mount with 5.7 inches in length is compatible with all picatinny as well as weaver standard scopes.

#6. CVLIFE 6-9 Inches Bipod with Adapter for M-Rail

Our bipod is exceptionally high-strength and light-weight, which is 100% made of real carbon fiber , aluminum alloy and hardened steel. Fast & Easy to install: Put the adapter into the M-rail and tighten it by hex wrench, loose the thumbscrew and connect the stud of the adapter to the bipod clamp, tighten the thumbscrew. With corrosion resistant and wear-resistant function, the carbon fiber bipod is built to perform different environment especially harsh condition like raining and sandstorm,etc. This bipod has robust springs tension control and leg release button, the leg length can be adjusted from 6 inches (152mm) to 9 inches (225mm). The rubberized feet is non-slip and stable in order to reduce recoil damage from the gun.Also, it gives a strong support during the shooting or hunting.

#7. WINCENT Double Long Rifle Bag Case, Soft Padded Tactical Pistol Gun Range Bag Firearm Transportation Backpack – Lockable Zipper， Available Length in 36″ 42″ 46″

The rifle bag is made of heavy-duty 600D Oxford cloth which is water and wear-resistant and offers protection for your firearms and other accessories during transportation. Perfect for military training, hunting, hiking, paintball, air-soft use and other activities.

This tactical rifle case is spacious enough to hold multiple firearms and ammo. Two main compartments can accommodate 2 long guns such as rifles, shotguns, carbines and supplies like pistols, handguns, goggles, log books and cleaning kits. Exterior with 2 pockets and 3 pouches adds extra storage space for other tools.

This durable gun bag is thick-padded inside the storage compartment and thus allowing two rifles to be carried without scratching or damaging each other as well as providing protection for other weapons against knocks and bumps.

The double rifle case allows 3 ways to carry along — backpack design for hands free transport; heavy duty wrap-around handgrip for single-hand lift; removable single shoulder strap attaches to metal D-rings for easy carrying.

The multifunctional rifle bag comes equipped with MOLLE webbing system for easy attachments of a large variety of tools. Designed with two-way lockable zippers around the storage compartments for convenience. Adjustable snap buckle straps for securing firearms and additional gears in place and allows customized adjustments with regards to specific needs.

When it comes to buying a rifle, whether it is for self-defense, hunting, target shooting, or competition shooting, most people think of the AR-15 first. It is definitely the most popular semi-automatic rifle in the US, and its Automatic versions like the M4 and other variants are used by Law enforcement and militaries all over the world.

However, few people know much about the Predecessor to the AR15, which was named the AR-10. The AR-15 in fact is a scaled-down version of the AR-10, which is a very capable rifle, and was ahead of its time when designed.

So, let’s talk more about the AR-10, and why you should buy one.

What is the difference between the AR-10 and AR-15?

In simple words, the main difference between the AR-10 and AR-15 is the caliber. When the AR-10 was designed, battle rifles were more common among militaries, and law enforcement, which used larger calibers. Around that time, most of the western countries were adopting rifles chambered in the 7.62×51 caliber round, like the FN-Fal and H&K G3. So, Eugene Stoner, an American Weapons designer came up with the design for the AR-10, which was revolutionary for the time. The AR-10 was lighter than other rifles, and because of its direct impingement operating system, and ergonomics, it was also considerably more controllable. It fires the popular 7.62 NATO caliber (also known in the civilian market as .308 Winchester) and was presented for military trials in the US, however, it was initially rejected in favor of the M14, since it had a familiar design to the M1 Garand, and it would be easier for weapon manufacturers to tool up for mass production.

Later on, when the military needed a smaller caliber rifle, Store designed the smaller version of the AR-10, chambered in the 5.56x45mm caliber, and designated it as the AR-15, which was adopted by the military as the M16.

Now, since the AR-10 has a larger caliber, it is also heavier, with a heavier barrel and larger receiver. Otherwise, the trigger mechanism, operating system, ergonomics, and controls of both rifles are virtually identical.

Why buy the AR-10?

The AR-10 is a very capable rifle in a variety of roles. From self-defense to hunting, the AR-10, with its heavy caliber, can extend the range of application that you would get from an AR-15, or a stand-alone hunting rifle.

This was quite prominent after the US military started using the AR-10 as the M110 Semi-Automatic Sniper System. It allows US snipers to have a long engagement range, while still being able to effectively defend themselves at close quarters.

Therefore, if you are looking for a rifle that is versatile, and can fit multiple roles, the AR-10 is a very good option.

In terms of self-defense, the AR-10 and its .308 Winchester caliber are very effective, both at close range and long-range. Many people typically say that the .308 is too big of a round for self-defense, and over-penetration can be an issue with it. Where there is truth to that in some situations, with the right rind of ammunition, these problems can be avoided. Moreover, I won’t say that the AR-10 is the perfect self-defense weapon for every situation, but it is one that can be very effective for self-defense while filling a variety of other roles as well.

In terms of hunting, the .308 Winchester is very capable, and with the platform of the AR-10, it can make it even easier to land follow-up shots, and take down big game. The AR-10 is also perfect for target shooting even at long ranges, and it is ideal for the protection of large properties.

So, the AR-10 is a rifle that fits the roles of survival, self-defense, and sporting weapon very effectively and it is a rifle you should consider having in your arsenal.

When talking about iconic American Rifles, many people talk about the M14, M1 Garand, or the modern AR15 and its Military versions. However, an incredible American rifle, that doesn’t get as much recognition, is the AR-10.

It is essentially the older brother of the AR-15 and its predecessor. The AR-10 was the first rifle designed by Eugene Stoner to use the revolutionary direct impingement system. It was originally chambered in 7.62 x51mm and is still in wide use in the US, and to some extent in the Military as well.

History of AR-10:

The History of the AR-10 started in the late 1950s, all over the world, militaries were modernizing their small arms around the time, the Soviets had their AK-47s, and the west had the FN-Fal, also called the right arm of the free world and the H&K G3.

So, in the US, the military was also looking to modernize, and adopt the popular 7.62x51mm caliber, instead of the 30.06 used in the M1 Garand. Instead of going for the Fal or the G3, they opted to go with American Made rifles and started military trials.

Around this time, Eugene Stoner, the designer of the AR-10, was working for a company named Armalite, which was a subsidiary of the Fairchild Aircraft company. He designed the AR-10 for military use, however, his submission to the US Army trials was a little hasty.

The AR-10 went against the Springfield T44 and FN-Fal, and as it was a late entrant, all the caveats of the rifle weren’t refined. Though it was lighter and easier to shoot than any other battle rifle of the time, and initially got favorable responses it could not win the Military contract.

Instead, the Springfield T44 was selected by the Army, and designated as the M14. However, the story of the AR-10 does not end there. Armalite continued to look for international contracts for the AR-10. Learning from the failures in the military trials, they refined the AR-10 design, mainly to include a full steel barrel instead of the aluminum-steel composite barrel that burst on one of the military testing rifles.

The rights for the manufacturing of the AR-10 were sold to a Dutch manufacturing company named Artillerie Inrichtingen for 5 years. During this time, the AR-10 was refined and many changes were made. It was also exported to multiple countries, and its refinement has been divided into three patterns by firearm experts. There are the Sudanese pattern AR-10s, Transitional Pattern AR-10s, and the Portuguese Pattern AR-10s.

The Sudanese pattern gets its name because the Sudan military ordered 2500 AR-10a at the time and specific changes were made for their needs. The Portuguese pattern rifles were sold to Portugal, and some other countries in small numbers and the transition pattern rifles came between the two designs.

The AR-10 wasn’t used or developed frequently after that, since Armalite sold its design to Colt, and the company slowly went out of business. It was bought by a company from the Philippines and later bought by a former Army Ordnance officer Mark Westrom, owner of Eagle Arms, in the late 90s. The Armalite AR-10B was then produced as a modernized version of the original AR-10, with many refinements that were made in the AR-15.

Around that time, the Knight’s Armament Company also developed the SR-25, which was based on the AR-10 design. This rifle was also used by the US military, and designated as the M110 Semi-Automatic Sniper System. It is still in service with US army Snipers, and by some other countries as well.
These days, modern versions of the AR-10 are also popular among civilians, why use them for self-defense, hunting, and sport shooting as well.

In this blog we are taking a close look at the best AR 10 rifles available on the market. Although in our next episode, we will feature the best AR-10 upper receivers, Best AR-10 lowers, and best AR-10 kits.

Without further ado… let’s get started.

#1. M5E1 Complete Rifle, 16″ .308 Stainless Steel Mid-Length Barrel

The Aero Precision M5E1 Complete Rifle with 16″ .308 Stainless Steel Mid-Length Barrel is built on our popular Enhanced Series Upper Receiver. This system features a custom integrated upper receiver and handguard system that provides the shooter a light-weight, free-floated, rigid design resulting in superior performance and accuracy.

All complete rifles are assembled by our professional gunsmiths and are tested prior to leaving our facility. Buy with confidence when you purchase a Complete Rifle from Aero Precision.

Upper Features:

• Upper: M5E1 Enhanced Upper Receiver
• Barrel: 16″ .308 Stainless Steel Barrel, Mid-Length, 1:10 Twist, 416R Stainless Steel, Bead Blasted
• Handguard: Gen 2 Enhanced Series Handguard of choice
• Gas System: Low Profile Gas Block and Mid-Length Gas Tube
• Bolt Carrier Group: M16 Cut, 8620 Steel, Phosphate Finish, Properly Staked
• Muzzle Device: Standard AR 308 A2 Birdcage Flash Hider

Lower Features:

• Lower: Gen 2 Lower Receiver with flared magwell and tension screw
• Lower Parts Kit: Standard .308 Lower Parts Kit
• Buffer Kit: M5 .308 Carbine Buffer Kit
• Stock: Magpul STR Stock
• Grip: Magpul MOE Grip
• Magazine: Magpul 20 Round PMAG®

SPECS

Shipping to FFL Dealer Required	Yes
Made In America?	Yes
Caliber	.308 Winchester
Barrel Length	16″
Weight(s)	12″ KeyMod – / 12″ M-LOK – / 12″ Quad Rail – / 15″ KeyMod – / 15″ M-LOK – / 15″ Quad Rail –

#2. Armalite AR-10 Tactical Rifle

A tactical workhorse, the AR10TAC16 is the perfect tool for duty and defense. All Armalite Tactical Series rifles come equipped with MAGPUL MBUS flip-up sights and MOE+ pistol grips. The dual-purpose flash hiding compensator tames recoil while reducing signature. The sturdy 15” tactical MLOK handguard provides ample hand placement and a full-length MIL-STD 1913 12 o’clock rail for sights an accessories. An adjustable gas block also allows the rifle to be individually tuned for optimal performance for your choice of ammunition and/or suppressor use.

SPECIFICATIONS

Attachment Method: MLOK Product Line: AR-10 Product Category: Tactical Caliber: 7.62×51 NATO Barrel: Stainless Steel, Black Nitride Barrel Length: 16″ Twist Rate: 1:10 RH Muzzle Device: ARMALITE TACTICAL BRAKE Handguard: ARMALITE 15″ M-LOK TACTICAL Stock: 7-POSITION COLLAPSIBLE Trigger: ARMALITE TWO-STAGE PRECISION Length: 35.5″ Collapsed | 39.5″ Extended Weight: 8.5 LBS. Included: One 25-Round Magpul PMAG, Owner’s Manual.

#3. GGP HEAVY .308 MKII™

Grey Ghost Precision worked hard to produce an extremely accurate .308 WIN semi-automatic rifle that fit specific requests from soldiers operating in Afghanistan. Coupled with evaluations by Special Forces marksmanship instructors, competition shooters and hardcore hunters, the final form of the “Barking Dog” has several cutting-edge enhancements that make it the most reliable nail-driver in its class.

The GGP Heavy .308 MKII Rifle: a New Benchmark in the DMR World!

The DD5 V3 builds upon the foundation Daniel Defense established in 7.62 AR-style rifles. This highly accurate and durable rifle includes an adjustable gas block that allows for a consistent feel whether shooting suppressed or unsuppressed. The perfected bolt carrier group reduces overall recoil impulse and is easy to maintain and operate in all conditions. Designed around a Cold Hammer Forged barrel with an innovative 4-Bolt Connection System, this design dramatically increases the connection surface area between the barrel and upper receiver for increased rigidity/stability to wring out accuracy traditionally only found in high-end bolt action rifles. The DD5 platforms have upgraded controls like ambi bolt catch, magazine release, safety selector and Daniel Defense enhanced furniture. The DD5 V3 sets a new benchmark in performance for 7.62 AR-style rifles.

• > User-adjustable gas block for reliable suppressed shooting
• > Superfinished and DLC-coated bolt carrier group makes it easy to clean and operate in all conditions
• > Bolt carrier is equipped with a buffer for optimized cycling and improved recoil impulse
• > Bolt is designed with enhanced extractor geometry and dual ejectors for reliable cycling
• > 16″ Cold Hammer Forged proprietary steel chrome-lined barrel for a lifetime of accuracy and durability
• > Innovative 4-Bolt Connection System to ensure greater accuracy
• > GRIP-N-RIP independently ambi charging handle with anti-gas features for a better shooting experience

MATERIALS & CONSTRUCTION

• LOWER RECEIVER: Enhanced Flared Magazine Well and Rear Receiver QD Swivel Attachment Point. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized
• UPPER RECEIVER: CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized
• BARREL: DD Proprietary Steel, Cold Hammer Forged, 1:10” Twist, 16″ S2W Profile, Intermediate Gas System, Chrome Lined, Mil-Spec Heavy Phosphate Coated
• GAS SYSTEM: User-Adjustable Gas Block CNC Machined of 4140 Hardened Steel and Mil-Spec Heavy Phosphate Coating, Intermediate, Direct Impingement
• MUZZLE DEVICE: Daniel Defense Superior Suppression Device, 17-4 PH Stainless Steel, Salt Bath Nitride Finished
• TRIGGER: Daniel Defense Mil-Spec
• HANDGUARD: Daniel Defense DD5 Rail 15.0, CNC Machined of 6061-T6 Aluminum, M-LOK Attachment, Type III Hard Coat Anodized
• RECEIVER EXTENSION: 6 Position Mil-Spec 7075-T6 Aluminum
• BUTTSTOCK: Daniel Defense Buttstock, Glass Filled Polymer with Soft Touch Overmolding
• PISTOL GRIP: Daniel Defense Pistol Grip, Glass Filled Polymer with Soft Touch Overmolding
• MAGAZINES: Accepts All SR-25 Magazines

#5. Bushmaster BF XM-10 308 ORC Semi-automatic 7.62x51mm

Bushmaster XM-10 308 ORC 7.62 NATO Semi-automatic Rifle. More firepower in a lightweight, easy-to-handle Sporting Rifle. Discover the difference! The Bushmaster BF XM-10 .308 Winchester ORC (Optics Ready Carbine) provides big game hunters with a powerful, accurate, lightweight alternative to traditional bolt-action and lever-action .308 rifles. Optics-ready design is ideal for the shooter who plans on adding custom optics. Special features:16″ heavy profile with mid-length gas system and A2 birdcage flash hiderReceiver length Picatinny optics rail with two 1 3/4″ optics risersMilled gas blockHeavy oval hand guardSix-position telescoping stock TM reduces overall length by 4″ when collapsed for convenient carryShips with operator safety manual, chamber flag, sling and 20-round magazineBushmaster XM-10 308 ORC Rifle specs:Caliber: .308 Winchester / 7.62 NATOAction: Semi-automaticCapacity: 20+1Barrel length: 16″Barrel material: 4150 chrome-moly steel with chrome-lined bore and chamberBarrel twist: 1 x 10″Upper receiver: Machined from 7075 T6 aluminum forgingsLower receiver: Machined from 7075 T6 aluminum forgingsSights: none (optics ready)Flash hider: A2 birdcageOverall length: 37 1/4″Overall weight: 7.75 lbs.

#6. Sig Sauer 716i Tread

Familiar handling, unfamiliar power, SIG SAUER has taken the proven features of the SIG516 and applied them into a potent AR-based rifle chambered in 7.62 NATO. Utilizing the tried and true Direct Impingement System, an M1913 Mil-Std rail, free-floating barrel, aluminum forend, and telescoping stock, the SIG716 is the rifle of choice when you require the power of a larger caliber carbine.

#7. Brownells BRN-10 308 Win Retro Rifle

The BRN-10® by Brownells is a recreation of Eugene Stoner’s original lightweight .308 caliber battle rifle that revolutionized rifle design forever. For the first time, it is possible for the shooter of average means to own – and shoot – a meticulously detailed, factory-new, semi-auto replica at a fraction of a scarce original’s price. The BRN-10® accurately replicates the original .308 AR in great detail – and it’s built to modern standards using the latest manufacturing technology.

21st Century Technology Meets Historical Detail. Designed in partnership with FM Products, our BRN-10® receivers are fully machined, not forged, from 7075 T6 aluminum billet. The distinctive lines of late Armalite® AR-10® rifles are carefully reproduced, including the slab-sided lower with straight magazine well. Takedown pins, selector lever, magazine release, and bolt release all have crisp horizontal serrations that match the original rifles.

Clean, Uncluttered, Still “Futuristic”. The absence of a forward assist and shell deflector makes the BRN-10® upper unusually uncluttered. Up top is the original “trigger”-style charging handle prominently located under the carry handle and positioned for rapid, easy operation – a practical benefit somewhat lost with the later charging handle location.

The BRN-10’s rear sight is fully enclosed by the carry handle, like the original. A simple, A2-style horizontal thumbwheel lets you adjust elevation, while windage is changed by loosening a setscrew and drifting the rear peep. A small window in the rear of the carry handle lets you see the current elevation setting.

Detail Under the Hood. Inside the BRN-10®, the carrier has the distinctive flats and two stabilizing flanges at the rear found on early carriers, and the entire bolt/carrier group is chrome-plated. The bolt itself is machined from 9310 carbon steel and magnetic particle inspected (MPI) to make sure there are no microscopic flaws that could cause premature failure – a benefit the original guns did not have.

The BRN-10’s 20″ barrel, chambered in .308 Winchester, is made for Brownells by Faxon. It first gets a QPQ Nitride finish for excellent resistance to surface wear. After nitriding, the barrel gets top coat that replicates the look of the classic manganese phosphate finish found on the 1950s rifles.

The handguard drops in like a standard AR-15 handguard, but its external contours replicate the original AR-10® ’guard. Buttstock and pistol grip are from the Brownells Retro line; the buttstock is a Type D stock, without a trap door.

Up-to-Date & Compatible. Brownells BRN-10® rifles accept standard metal DPMS/SR-25 magazines. They are NOT compatible with Magpul PMAGs due to lower receiver contour. A majority of the components on the BRN-10® are compatible with modern DPMS/SR-25 parts or AR-15 parts. See Compatibility Notes below.

#8. DPMS Panther Oracle .308 AR-10 20rd 16″ Rifle 60560

The .308 Oracle, much like it’s 5.56mm little brother, is one of our most popular rifles due to its compact size, rugged military carbine features and .308 firepower. Just add optics and ammo and it’s ready to hunt or turn heads at the range.

#9. Rock River Arms LAR-8 Operator 308 Winchester Rifle

The quality and reliability of Rock River Arms firearms continues to win new admirers. The U.S. Drug Enforcement Agency (DEA) and Federal Bureau of Investigation (FBI) put a variety of different manufacturers rifles through an exhaustive trials process, and based on those trials awarded Rock River Arms with a 5 year contract as their primary supplier. Since that time Rock River Arms has received additional federal contracts.

Rock River Arms is one of the fastest growing firearms manufacturers in the country, but remains committed to continuing to provide its civilian, law enforcement and military customers with the kind of custom products and services on which it’s reputation has been built.

#10. HK & Koch MR308 A3 – 16.5

The semi-automatic rifle in a AR-10 design featuring the reliable G36 gas piston system in high caliber .308. Now completely operational on both sides. Suitable for all static and dynamic rifle disciplines.

Features

• > Slim line handguard with HKey mounting slots
• > Transparent polymer magazine available as a 2, 5, 10 or 20 rounds magazine
• > Ambidextrous bolt catch lever with with protective wall to prevent accidental release of the bolt
• > Ambidextrous magazine release lever
• > Quick-change sight
• > Slim Line buttstock with an adjustable length and 5 locking positions
• > hard chrome plated barrel
• > Available in black or RAL8000

PSA 10.5″ PISTOL LENGTH 300AAC 1:8 PHOSPHATE 12″ SLANT M-LOK MOE EPT SBA3 PISTOL – 5165448816.

DETAILS

PSA 10.5″ Pistol Length 300AAC 1:8 Phosphate 12″ Slant M-LOK MOE EPT SBA3 Pistol – 5165448816

Gas System: Pistol Length
Barrel Profile: Heavy
Barrel Steel: 4150V Chrome Moly Steel
Barrel Finish: Phosphate
Chrome Lining: None
Muzzle Thread: 5/8-24
Chamber: 300AAC Blackout
Twist Rate: 1 in 8″
Barrel Extension: M4
Diameter at Gas Block: .750″
Gas Block Type: Low-profile
Muzzle Device: Fluted Flash Can
Receiver Material: Forged 7075 T6 Aluminum
Receiver Type: A3
Handguard Type: PSA 12″ Slant End Lightweight  M-Lok
Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158
Bolt Carrier Profile: Full-auto
Charging Handle Included: Yes
Lower Receiver: Forged 7075 T6 Aluminum
Receiver Finish: Hardcoat Anodized Black
Fire Control Group: Single-Stage, Enhanced Polished Trigger
Grip: Magpul MOE Grip, Black
Buffer Tube: 7075 T6 Aluminum 
Adjustment: Fixed
Pistol Brace: SB Tactical SBA3 Adjustable Pistol Brace, Black
Magazine: 30 Round Aluminum

FEATURES

Barrel: 4150V chrome moly steel. Chambered in 300AA Blackout, with a 1:8 twist rate, M4 barrel extension, pistol-length gas system, and phosphate coated.  This heavy profile barrel is finished off with a PSA 12″ Lightweight Slant End M-Lok free-float rail, .750″ low-profile gas block, and PSA Fluted Flash Can.

Upper: Forged 7075-T6 A3 AR upper is hard coat anodized.  These uppers are made for us right here in the USA!

Bolt: Full-auto profile bolt carrier group. Shot-peened, mil-spec Carpenter No. 158® steel bolt. Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. 8620 steel M-16 profile carrier is nitride treated.

Lower: These forged lowers are quality made using 7075-T6 aluminum and are marked “MULTI” for caliber. Finish is hardcoat anodized. Pistol 7075-T6 buffer tube is hardcoat anodized and is fitted with an SB Tactical SBA3 Adjustable Pistol Brace, Magpul Grip, and Enhanced Polished Trigger (EPT). 

PSA 10.5″ CARBINE-LENGTH 5.56 NATO 1/7 NITRIDE LIGHTWEIGHT M-LOK MOE EPT SBA3 PISTOL – 5165448581

DETAILS

Gas System: Carbine-length
Barrel Profile: A2
Barrel Steel: 4150V Chrome Moly Steel
Barrel Finish: Nitride
Chrome Lining: None
Muzzle Thread: 1/2-28
Chamber: 5.56 NATO
Twist Rate: 1 in 7″
Barrel Extension: M4
Diameter at Gas Block: .750″
Gas Block Type: Low-profile
Muzzle Device: A2 Flash Hider
Receiver Material: Forged 7075 T6 Aluminum
Receiver Type: A3
Handguard Type: PSA 9″ Lightweight  M-Lok
Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158
Bolt Carrier Profile: Full-auto
Charging Handle Included: Yes
Lower Receiver: Forged 7075 T6 Aluminum
Receiver Finish: Hardcoat Anodized Black
Fire Control Group: Single-Stage, Enhanced Polished Trigger
Grip: Magpul MOE Grip, Black
Buffer Tube: 7075 T6 Aluminum 
Adjustment: Fixed
Pistol Brace: SB Tactical SBA3 Adjustable AR-15 Pistol Brace, Black
Magazine: 30 Round Aluminum

FEATURES

Barrel: 4150V chrome moly steel. Chambered in 5.56 NATO, with a 1:7 twist rate, M4 barrel extension, carbine-length gas system, and nitride treated for accuracy and durability.  A2 profile barrel is finished off with a PSA 9″ Lightweight M-Lok free-float rail, .750″ low-profile gas block, and A2 Flash Hider.

Upper: Forged 7075-T6 A3 AR upper is hard coat anodized.  These uppers are made for us right here in the USA!

Bolt: Full-auto profile bolt carrier group. Shot-peened, mil-spec Carpenter No. 158® steel bolt. Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. 8620 steel M-16 profile carrier is chrome lined and phosphate coated.

Lower: These forged lowers are quality made using 7075-T6 aluminum and are marked “MULTI” for caliber. Finish is hardcoat anodized. Pistol 7075-T6 buffer tube is hardcoat anodized and is fitted with an SB Tactical SBA3 Adjustable Pistol Brace, Magpul Grip, and Enhanced Polished Trigger (EPT). 

Palmetto State Armory (PSA) is a well-known company. They are known for their line of AR-15’s, AR 15 Parts and the PSA AKV, a 9mm AK. They also feature a wide selection of other industry top related brands from complete firearms to parts and accessories and more.

Take a look at the PA-10 AR-10 DPMS review from Palmetto State Armory.

PA-10 AR-10 DPMS Details

Barrel Length:	18”
Barrel Material:	416R Stainless Steel
Barrel Profile:	A2 Style
Chamber:	.308 WIN (7.62×51 NATO)
Twist Rate:	1 in 10”
Gas System:	Mid-Length
Gas Block Type:	Low-profile 5 position click switch adjustable gas block
Receiver Materials:	Forged 7075 T6 Aluminum
Receiver Finish:	Hardcoat Anodized
Receiver Style:	PA10 Flat top with Feed Ramps
Stock:	Magpul STR, Black
Grip:	PSA rubber over-molded A2 Grip
Fire Control Group:	PSA Enhanced Polished Trigger (EPT)
Magazine:	20 round Magpul PMAG

The US has a very rich history in firearms manufacturing, and some of the most innovative firearm designers are from America. One of these weapon designers, who has undoubtedly had a massive impact on the small arms of the world, is Eugene Stoner, the designer of both the AR-10 and AR-15 rifles.
Both these rifles and their variants have seen widespread use in the US and all over the world, by civilians, law enforcement, and Militaries. Both rifles are very similar in design, with the main difference between them being the caliber.

The AR-10 is chambered in 7.62 Nato or .308 Winchester, whereas the AR15 is chambered in 5.56×45 or .223 Remington. The AR-15 was essentially a scaled-down version of the AR-10, which was designed to meet the requirements of the US military in the late 1950s.

History of the AR-10 and AR-15:

It all started in 1956 when the US military opened a competition for the adoption of a new rifle to replace the M14. Around that time, Many nations in the world, especially in the west, started using the 7.62 x51 caliber, some in the FN-Fal and others in rifles like the H&K G3. Eugine Stoner also designed a rifle in the caliber to submit for the Military trials. At that time, he was working for Armalite and developed a rifle they named the AR-10.

The AR-10 was better than the competition in many ways, however, it was still rejected in favor of the Springfield Armory T44 design, which got the military designation of the M14. Since the M14 was similar in mechanism and operation to the M1 Garand, the Army believed that it would be a better replacement, and be easier to integrate into the Army.

The drawbacks of the M14 were exposed during the Vietnam Conflict when it was put against the AK-47s used by the Vietnamese. The M14 was difficult to control in full auto, and the soldiers couldn’t carry enough ammo to keep up with the sustained fire of the AK-47s.

So, the US military was now looking for a smaller caliber rifle that could be as effective as the AK-47s. Eugine stoner designed a scaled-down version of the AR-10, chambered in the new 5.56×45 caliber. The rifle was called the AR-15 and submitted to the Army for testing, however, the Army rejected it. Around this time, the parent company of Armalite named the Fairchild Aircraft company was in serious financial strain, and it decided to sell off the right of the AR-15 rifle pattern to Colt.

The Fairchild president Richard Boutelle and Air Force Vice Chief of Staff General Curtis LeMay were good friends, and at a party, they started talking about the AR-15. They decided to shoot some watermelons with the rifles, and General LeMay really liked it. The rifle was tested and LeMay placed an initial order of 8,500 AR-15s for the Air Force, a year later, after rigorous testing, the Air Force ordered an additional 80,000 AR-15s to be issued to airmen.

So, the Secretary of Defense at the time, Robert McNamara ordered another detailed testing of the AR-15. After a lot of testing, and some changes to the platform, it was finally adopted by the military and named the M16.

Difference between the AR-10 and AR-15:

As mentioned before, in terms of design and ergonomics, the AR-15 and AR-10 are very similar rifles, with the main difference being the Caliber. Chambered in the smaller 5.56 caliber, the AR-15 is a more general-purpose rifle that can work in a variety of roles, whereas the AR-10, with its larger 7.62×51 caliber rounds, fits a more specific role, that is of the DMR. AR-10s are in service with the military and are also quite popular among civilians and hunters.

Because of the larger caliber, the AR-10 also has a heavier barrel, and a larger bolt and receiver. Therefore, it is also heavier than a standard AR-15.

Final thoughts.

Both the AR-15 and AR-10 are two of the most innovative firearms of modern times, and the fact that the AR design is still in service with the US military, and is used all over the world, is a testament to the effectiveness of the rifle.