AR-10 BARREL EXTENSION | AR308 BARREL EXTENSION

Picture of an AR-10 Barrel Extension

AR-10, 308 AR/AR308, DPMS G2 Barrel Extensions

We frequently get inquiries from shooters looking for AR-10 Barrel Extensions. Of course if you have been following this site long enough you know that they probably are not looking for AR-10 barrel extensions but instead  in most cases looking for DPMS LR-308 compatible 308 AR/AR308 barrel extensions. Furthermore if one has the skills to mate a barrel and barrel extension why limit themselves to Armalite AR-10 bolt carrier groups.

Barrel Extension Considerations

  1. Armalite AR-10 and DPMS Compatible Barrel Extensions are different. The require different bolts.
  2. The barrel extension dictates the bolt to be used with the carrier
  3. AR-10 can use a DPMS barrel with a DPMS barrel and barrel extension as long as a DPMS 308 bolt is used
  4. DPMS platform can use an AR-10 barrel and barrel extension as long as an AR-10 bolt is used
  5. Do not use the same bolt with more than one barrel. Every barrel extension/barrel combination requires it’s own dedicated bolt.
  6. Theoretically AR-10 and DPMS 308 Bolt Carriers are interchangeable as long as the bolt style matches the barrel extension
  7. DPMS G2 (DPMS GII) is not compatible with AR-10 or DPMS 308 barrel extensions. G2 is a different platform completely

Note: While above we state the interchangeability between AR-10 and DPMS platforms we feel it is bad practice and unnecessary to mix the brands.

Note: To date the only place we know to acquire an actual AR-10 barrel extension is from Armalite. DPMS is the standard most manufacturers have adopted. Be careful when a seller refers to AR-10. If compatibility isn’t clear and obvious contact the manufacturer or vendor.

Picture of a WMD Guns NIB-X 308 AR and AR-10 Barrel Extension

WMD Guns NIB-X 308 AR Barrel Extension

WMD’s 308 AR Barrel Extension has been NiB-X coated to increase lubricity and provide for smooth locking and unlocking with the critical bolt interaface. Feed ramps are 45°. The entire barrel extension is polished.

M4-type barrel extension has NiB-X finish that aids in smooth locking and unlocking with the bolt, consistent feeding and helps prevent hang-ups. This high-tech coating lasts the life of the weapon, and won’t rub off, flake off, or gall. Helps dissipate heat for cooler operation, too. Precision machined from 8620 steel to USGI specifications with integral M4-type feed ramps and predrilled locator pin hole.

Picture of an AR10 BAT Machine AR308 Barrel Extension

BAT Machine AR308 Barrel Extension

Precision barrel extension made for the AR-10 (DPMS style) rifle platforms. These extensions are completely machined in the hard condition to provide the most accurate extension possible. The BAT Machine AR308 Barrel Extension is machined 4140 chrome-moly steel barrel extensions help the custom rifle builder ensure a secure barrel fit for best alignment and accuracy. Heat treated for surface hardness to give years of reliable service. Available for M4 carbine extension with feed ramp cuts. AR-Style .308 extension fits the DPMS LR-308 and other .308s with the same thread pattern, plus it offers M4-style feed ramp cuts to ensure extra reliability in getting rounds from the magazine to the chamber. All models have pre-drilled locator pin hole.

SPECS: 4140 chrome-moly steel, in-the-white. AR-Style .308 –1.200″ O.D., .940″ I.D., w/M4-style feed ramps. Fits DPMS LR-308, Remington R-25, and other AR-Style .308 rifles with same receiver thread pattern.

Picture of a Lilja Barrels AR-10 .308AR Barrel Extension

Lilja Barrels .308 AR Barrel Extension

Adam Lilja dropped us a message to let us know Lilja Barrels is now offering a 308 barrel extension they make in-house. These are a top-quality 308AR barrel extensions made on CNC equipment with a single-point thread. Following heat treat we hard-turn the outside diameter and true the face and lugs for maximum concentricity and elimination of any distortion from heat treat. Custom AR builders can now use the same extensions they use on their finished drop-in barrels.

Picture of an AR-10 Barrel Extension

Miller Precision Arms 308 AR, AR308 Barrel Extension

Miller Precision Arms 308 AR, AR308 Barrel Extension features machined 4140 chrome moly steel barrel extensions help the custom rifle builder ensure a secure barrel fit for best alignment and accuracy.

Description

  • Heat treated for surface hardness to give years of reliable service.
  • Available for M4 carbine extension with feed ramp cuts.
  • AR-Style .308 extension fits the DPMS LR-308 and other .308s with the same thread pattern, plus it offers M4-style feed ramp cuts to ensure extra reliability in getting rounds from the magazine to the chamber.
  • All models have pre-drilled locator pin hole and pin is included.

ELFTMANN 308 AR AR-10 TRIGGERS | Drop-In Trigger

Elftmann AR-10 Triggers

Elftmann Tactical AR-10, 308 AR Straight Trigger

The Elftmann ELF Drop-In AR-10 Trigger has been built to withstand the punishment of high powered calibers. The only AR-10 trigger using aerospace grade sealed bearings, making for an incredibly smooth and fast trigger pull. Our exclusive .043 double double wound polished piano wire hammer spring ensures full ignition of any ammo including .308 and 7.62x39. Pull weight from 2 3/4lbs to 4lbs is so easy to adjust it can be done in seconds without removing the trigger from your lower receiver. The AR-10 trigger is essentially the service trigger with a lighter pull weight range.

A second-to-none AR-10 drop-in trigger system that is strong and light, made of wire EDM machined, hardened A2 tool steel and lightweight aircraft-grade aluminum. Installation can be done in minutes using your AR’s original hammer and trigger pins. The AR-10 trigger may be ordered with a curved or straight shoe.

The amazingly short take-up, glass-rod crisp break and next to zero overtravel can be compared to the finest custom 1911 triggers. Adjustability puts you in charge based on your preference. If you are looking for the finest adjustable trigger for your AR-10 platform, this is the trigger system for you

  • Fits any mil-spec AR-10 (Large pin Colt available)
  • Absolutely Drop-Safe regardless of pull-weight
  • Adjustable from 2 3/4lbs to 4lbs without removing from lower
  • Exclusive double double wound hammer spring and heavy hammer ensure proper ignition of any ammunition
  • Very short pull and reset allows for rapid follow up shots and greater accuracy
  • Sturdy trigger assembly designed for rugged, trouble-free use; Made of lightweight aircraft-grade aluminum and hardened steel
  • Unique design of disconnect allows full 1/4” width eliminating possibility of wear and double-firing
  • High performance trigger and hammer needle bearings for smoother and faster firing
  • 100% made in America with a Lifetime Guarantee!

Read about more AR-10 Triggers here….

Elftmann Tactical AR-10 308 AR Straight Trigger

Elftmann Tactical AR-10, 308 AR Straight Trigger

The Elftmann Tactical AR-10 / .308 Straight Trigger is specially designed to stand up to the heavy recoil produced by short-action cartridges in the AR-style .308 platform, ensuring that owners have a trigger system they can depend on, round after round.

Elftmann Tactical AR-10, 308 AR Straight Trigger

The Elftmann Tactical AR-10 / .308 Straight Trigger is machined and assembled with a combination of A2 tool steel and aircraft-grade aluminum. The trigger assembly also features needle bearings on hammer and trigger pivot points for smooth operation, and the hammer spring is double-wound from .043-inch piano wire in order to provide a more rapid lock time.

  • Drops into all standard AR-style .308 lower receivers (Large pin Colt available)
  • Adjustable pull weight from 2.75-4 pounds
  • Built with 1/4-inch disconnector for added resistance to wear
  • Installs with standard trigger pins

The Elftmann AR-10 / .308 Straight Trigger provides owners with a short trigger takeup and reset, providing enhanced accuracy and improved follow-up shots.

Elftmann Tactical AR-10 308 AR Curved Trigger

Elftmann Tactical AR-10, 308 AR Curved Trigger

When it comes to designing a trigger unit for AR-10 rifles, special attention has to be placed on producing a rugged, durable, recoil-proof system that still provides a high-quality pull. The Elftmann Tactical AR-10 / .308 Curved Trigger accomplishes those two goals and still manages to be packed with high-end features.

Elftmann Tactical AR-10, 308 AR Curved Trigger

The Elftmann Tactical AR-10 / .308 Curved Trigger is machined using a combination of tool steel and aluminum and contains a piano-wire hammer spring that’s double-wound in order to enhance lock time. The trigger and hammer both use needle bearings to provide a smoother, faster mechanism.

  • Drop-in design (Large pin Colt available)
  • Adjustable pull weight from 2.75-4 pounds
  • Built with 1/4-inch disconnector sear for added wear-resistance
  • Fits any Mil-Spec AR-style .308

The Elftmann Tactical AR-10 Curved Trigger is completely drop-safe and provides AR-style .308 owners with a crisp, clean pull paired with a short takeup and reset.

WMD NiBXBCG308-N 308 AR Bolt Carrier Group w Nitromet Carrier

WMD NiBXBCG308-N 308 AR Bolt Carrier Group with Nitromet Carrier

WMD NiBXBCG308-N 308 AR Bolt Carrier Group with Nitromet Carrier

WMD Guns NiBXBCG308-N 308 AR Bolt Carrier Group with Nitromet Carrier is a welcome addition to the ever growing field of 308 AR bolt carrier groups available to shooters today. For the price of a common phosphate 308 bolt carrier group WMD Guns offers a high performance alternative that features the slippery, corrosion and wear resistant Nitromet QPQ coating as well as a heavy duty buffered extractor. The NiBXBCG308-N offers a good option for suppressor equipped 308 rifles.

Visit or 308 AR Bolt Carrier Page

WMD NiBXBCG308-N 308 AR Bolt Carrier Group with Nitromet Carrier

SKU:NiBXBCG308-N

Check out the WMD Guns NiBXBCG308-N 308 AR Bolt Carrier Group Specs:
  • Bolt – 9310 heat-treated. Milspec gas rings. NiB-X coated (Rc70, 40% more wear-resistant than chrome).
  • Extractor – Manufactured, heat treated, and hardened per government drawings. Black extractor, buffer and heavy-duty spring. NiB-X coated.
  • Firing Pin – Manufactured, heat-treated, hardened, chromed and certified per government drawings.
  • Carrier – 8620 material, heat-treated and case hardened. Manufacturing tolerances on inside diameters tightly controlled. Nitromet QPQ processed for Rc55 surface hardness, durability and corrosion protection.
  • Gas Key – Hardened to USGI Specifications and attached using grade 8 hardened fasteners. NiB-X coated. Staked per military specifications.
  • Cam Pin – Manufactured, heat treated, hardened and certified per Government drawings. NiB-X coated.
  • Weight:1.17 lbs
What is Nitromet QPQ?

NITROMET™ SALT BATH NITRIDING MAXIMIZES RESISTANCE AGAINST CORROSION AND WEAR

Salt bath nitrocarburizing (SBN) is a popular alternative to hard chromium and physical vapor deposition (PVD). More effective
than hard chromium, SBN is extremely economical, with an array of well-documented benefits.

COST-EFFECTIVE HIGH PERFORMANCE COATING

  • Enhanced wear resistance
  • Increased corrosion resistance
  • Improved case hardness (extends wear surface)
  • Multiplied fatigue strength
  • Higher lubricity

Nitromet is a proprietary KC Jones trademark, originally developed by Kolene Corporation. Nitromet enhances the properties of SBN to provide optimal protection against corrosion and wear.

Nitromet Salt Bath Nitriding Available exclusively from KC Jones

  • Plating Engineered for enhanced wear and corrosion resistance : Choose from 2 finishes:
  • Standard – Quench Polish Quench® (QPQ), Uniform black finish, Deep, rich, black color, Case hardening, Conforms to materials standard  ASTM 2753C, Surface hardness = 56 HRC (minimum)

Salt bath nitriding is sometimes referred to as ferritic nitrocarburizing, as well as salt bath nitrocarburizing. It is a process that involves thermo chemical diffusion, where a compound layer of carbon and nitrogen is simultaneously introduced to the surface of ferrous metal parts. A variety of metals can be treated with salt bath nitriding, including carbon steel, stainless steel, and sintered and cast iron parts.

Primary Nitromet Salt Bath Nitriding Characteristics

  • Deep black finish Anti-seizing properties
  • Improved sliding
  • Uniform black color
  • Doubled bending fatigue
  • Doubled rotary bend strength
  • Zero galling (often associated with plated surfaces)

Nitromet salt bath nitriding is an economic way to increase resistance against corrosion and wear. This is true whether you seek a hard chrome replacement or a more economical solution.

MDT SKELETON CARBINE STOCK | PRS ALTERNATIVE

Picture of a MDT SKELETON CARBINE STOCK
Picture of a MDT SKELETON CARBINE STOCK

MDT SKELETON CARBINE STOCK

Modular Driven Technologies aka “MDT” is well know for being a leader on bolt action rifle chassis particularly their TAC21. MDT is also the rifle chassis provider for Brownells, Winchester, Weatherby and Mossberg to name a few. Many shooters may not realize that MDT also offers a skeletonized carbine stock that with proper buffer system hardware can also be used with the AR-15, AR-10 and 308 AR rifles (See the chart below). The MDT “SCS” is a great Magpul PRS alternative. Available in black or FDE.

Picture of a MDT SKELETON CARBINE STOCK With CHEEK RISER

MDT SKELETON CARBINE STOCK With CHEEK RISER

For about thirty dollars more than the standard MDT Skeleton Stock there is an upgraded version of the carbine stock the includes and adjustable cheek riser.

MDT SKELETON CARBINE STOCK

The MDT SKELETON CARBINE STOCK has been designed to allow maximum adjustability while minimizing weight. The adjustability allows each shooter to optimize superior ergonomics for multiple shooting positions. The weight has been minimized by skeletonization while retaining the strength of the stock. The SKELETON CARBINE STOCK is crafted in 6061 aluminum with Cerakote®.

The SCS without the cheekpiece weighs 1.43-1.48lbs depending on the length of the buffer tube used and without spacers.

The SCS has 3 QD attachment points (one on each side and one on the bottom) to allow the shooter multiple choices for carrying. The SCS also has provision on the bottom of the stock to allow for the attachment of a picatinny rail.

The user is able to finely adjust the LOP by using the wheel mechanism located on the body of the SCS. LOP can be locked into position by tightening the lower bolt. The angle of the SCS can also be adjusted by loosening the top two screws on the body. This allows the body to align with the buffer tube by using the scribe mark down the buffer tube and the offset scribe mark on the SCS body.

A soft foam guard has been placed on the SCS to allow for use with low optics. This foam guard provides comfort against the elements. The foam guards position is able to be adjusted by moving it horizontally along the buffer tube.

The buttpad on the SCS can be adjusted horizontally, vertically, and angularly. By loosening the setscrew on the rear portion of the buttpad, the buttpad can be adjusted vertically. Once the buttpad has been moved up, two screws will be revealed. To adjust the angle of the buttpad, or move it in the horizontal plane, these screws must be loosened.

The SCS must be used with a custom MDT buffer tube and standard castle nut. This MDT buffer tube has a scribe mark down the center to allow the shooter to zero the angle of the SCS if they wish. On the body of the SCS there is another machined marking to further allow the shooter to precisely angle their stock to suit their needs.

MDT Skeleton Carbine Stock Length of Pull Graph

MDT Skeleton Carbine Stock Length of Pull Graph

MDT offers various buffer tubes lengths to allow shooters to choose their Length of Pull. To use these buffer tubes with AR-15 and AR-10 buffer systems, one or more spacers will be included with your purchase.

  1. When using the 8.75” long SCS, an AR15 carbine buffer tube system can be used as it has the internal length of an AR-15 carbine buffer tube. AR-10 carbine buffer tube systems and AR-10/AR15 rifle buffer tube systems are not compatible.
  2. When using the 9.75” or 10.75” long SCS, an AR-10 Carbine Buffer Tube System can be used, as it has the same internal length as an AR-10 Carbine Buffer Tube. An AR-15 carbine buffer tube system can be used with the use of a .625” spacer inserted into the buffer tube.
  3. When using the 11.75” long SCS, an AR-15/AR-10 Rifle Buffer Tube System can be used, as it has the same internal length as an AR15/AR10 Rifle Buffer Tube. An AR-15 carbine buffer tube system can be used with the 2.3” spacer. An AR10 Carbine Buffer Tube System can be used with the 1.7” spacer inserted into the buffer tube.

The buffer tube comes in various lengths to allow for proper Length Of Pull (LOP) for any rifle, while maintaining the correct internal length for an AR-15 buffer system.

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FAXON FIREARMS BIG GUNNER PROFILE 308 AR DROP-IN BARREL

Picture of a FAXON FIREARMS BIG GUNNER PROFILE 308 AR BARREL

FAXON FIREARMS BIG GUNNER PROFILE 308 AR BARREL .308 Winchester

The Faxon Firearms Big Gunner .308 Win. Barrel’s profile is a marriage of Faxon’s Government and Pencil profiles that gives balance of manageable weight and high accuracy potential. It has the Government taper from the barrel extension to the gas block, then transitions to a Pencil profile from the block to the muzzle. Keeping weight at the rear maximizes rigidity and resistance to heat distortion, while removing it up front moves the center of gravity to the rear, keeping your “AR-308” nicely maneuverable.

Each Big Gunner .308 Win. barrel is machined from triple stress-relieved 416R stainless steel, and finished it with a tough, wear-resistant matte black QPQ Nitride finish.

  • Fits DPMS LR-308 Gen1 pattern upper receiver OR Armalite AR-10 upper when used with Faxon Bolt Carrier Group (not included)
  • 5R rifling with 1-10″ twist ensures both accuracy & easy of cleaning
  • 11° target crowned muzzle
  • 5/8″-24 threaded muzzle
  • Each barrel individually checked for headspace with custom gauges

Faxon Big Gunner .308 Win. Barrels are available in 16″ length drilled for a mid-length gas tube, as well as 18″ and 20″ lengths drilled for a standard rifle gas tube.

Gun Tech Note: These barrels are chambered for .308 Winchester. 7.62×51 NATO ammo requires deeper head spacing but will normally will fit the chamber and function. However, Faxon does not guarantee the function of 7.62×51 ammunition, particularly with tight, “mach” .308 Win headspacing.

FOSTECH ECHO AR-II TRIGGER | DROP-IN TRIGGER

PICTURE of a FOSTECH ECHO AR-II TRIGGER

FOSTECH ECHO AR-II TRIGGER

Based on a Hiperfire trigger the Echo Trigger has a unique feature that allows an AR to fire when the trigger is pulled and also when released. This translate into much more expensive trips to the gun range. My two initial observations are the trigger is quite expensive and also looks to be pretty complex. At this time I cannot confirm how this trigger functions in a 308 AR or AR-10.  If anyone has any experience with the echo trigger drop us a line. The Fostech Echo AR-II Trigger is in stock and available from Copper Custom Armament.

The Echo AR-II Trigger allows the shooter to select from 3 different settings.

Safe Mode: Firearm will not fire.
Semi-Automatic Mode: Firearm fires when trigger is pulled.
Echo Mode: Firearm fires when trigger is pulled and also when trigger is released.

The Echo AR-II Trigger is designed with safety being the utmost priority. When the shooter is in the Echo Mode and depresses the trigger one round is fired, if the target moves, the shooter can move the selector to the safe position and a second round will not fire upon release.

The ECHO AR-II TRIGGER has SEVERAL DISTINCT FEATURES

  • PATENTED Design that gained ATF Approval (Patent # US 8,820,211 B1)
  • Technology licensed through HIPERFIRE inside the Echo Trigger
  • Light, clean, and crisp pull in Semi-Automatic Mode
  • The Echo AR-II Trigger is packed full of cutting edge technology
  • Reliable function in Echo Mode .

The Echo AR-II Trigger is for many of the AR-15 platforms but not all.   The Echo AR-II Trigger NO LONGER comes with a stripped carrier with gas key. Customers made it very clear that they did not want to deal with a proprietary carrier.  FosTecH’s team of engineers developed the Echo AR-II so that it did not need that proprietary carrier.  If you have any questions about the Echo-AR-II trigger please go to  www.echoquestions.com  You can also call our office if you would like to talk to someone in person at 812-445-4028

BUILD an ARMALITE AR-10 | How do I Build an AR10 Online? | AR308

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