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The Brownells Complete .308 Bolt Carrier Group is designed to operate reliably in DPMS LR-308 pattern rifles chambered in .308, .243, 7mm-08, .338 Federal, .260 Remington, 6.5mm Creedmoor, or any other cartridge based on the .308 Winchester. These BCGs are manufactured to the same uncompromising standards as our M16-style BCGs.
Our Complete .308 Bolt Carrier Group has a bolt machined from robust 9310 steel, heat-treated and shot-peened for superb hardness. The carrier itself is fabricated from hardened 8620 steel. Both are magnetic particle inspected (MPI) to make sure there are no hidden microscopic flaws that could lead to premature failure.
You can get the Brownells Complete .308 Bolt Carrier Group with a hard Black Nitride finish that is exceptionally resistant to surface wear OR a Nickel Boron coating (a dull matte silver) that’s even harder and self-lubricating to boot. Both come complete with firing pin, firing pin retaining pin, cam pin, gas rings, gas key, extractor, and ejector installed.
Brownells GunTech™ Note: Unlike BCGs with a traditional Parkerized finish, the carrier on our Black Nitride bolt carrier group is not hard-chromed inside because Nitride is actually harder than industrial chrome plating.
The GEMTECH Suppressed Bolt Carrier is a drop-in replacement and will allow the shooter to choose between suppressed (S) and unsuppressed (U) settings without any permanent modifications to the firearm. No longer will you need to change gas blocks, buffers, or any other components. Not only that, but with the GEMTECH Suppressed Bolt Carrier, there is a reduction in carrier speed and less felt recoil, bringing the cyclic rate of the suppressed rifle down to unsuppressed levels. And in some systems, testing has shown that it can actually bring it LOWER than unsuppressed levels.
Reduced-weight bolt/carrier assembly helps tame felt recoil on a JP or DPMS or Remington AR-style .308 rifle (LR-308 pattern only). Carrier features the same type of weight-reducing cuts found on the original JPBC-3 AR-15 bolt carrier to give the same benefits your .308. Wide carrier rails have extra bearing surface to improve bolt alignment and reduce wear. Carrier key is already installed and staked. Available with QPQ or polished stainless finish.
See SPECS for the Compatibility Notice.
SPECS: JP Low Mass Operating System Bolt Carrier- Large-Frame (.308). Stainless Steel. Polished Finish. Requires DPMS-pattern bolt, firing pin and cam pin. Weight: 10.82 oz. with key installed.
JP Low Mass Operating System Bolt Carrier- Large-Frame (.308). Stainless Steel. QPQ Black Finish. Requires DPMS-pattern bolt, firing pin and cam pin. Weight: 10.82 oz. with key installed. Finish: QPQ Coating.
This notice pertains to any rifle based on the large-format AR-10-type or LR-308 platform typically chambered in .308 Winchester, 7.62x51 NATO or other cartridges requiring the longer magazine format.
Be aware that these receiver platforms are not standardized like the AR-15/M16 platform for which most parts are cross-compatible. Before ordering accessories and parts for your large-format rifle, make sure the parts are compatible with your particular platform. This bolt carrier is compatible only with the DPMS family of AR-10 products.
With the Armalite/Rock River family of large-frame receivers, this carrier can only be used as a complete bolt carrier assembly group with a DPMS-pattern bolt such as our .308 JP EnhancedBolt. Interchanging individual components will result in an unsafe configuration. Do Not under any circumstances mix and match components between the platforms.
Custom, stainless steel bolt carrier features a 100% increase in bearing surface for smooth cycling and outstanding reliability. Includes the dust cover notch for tactical duty or any application requiring absolute “no-fail” operation. Expanded, exterior, bearing surfaces are hand polished and ensure precise alignment in upper receiver for less wear. Non-plated carrier bore is roller burnished for low-drag movement. Rear of carrier is designed in the AR-15, semi-auto configuration with longer, mil-spec cocking pad in the front. Five-step QPQ process produces an exceptionally hard, wear-resistant high-lubricity black finish. Comes with steel gas key installed.
JP LMOS™ Bolt Carrier
Not for use in .308 AR-type rifles.
SPECS: 416 stainless steel, polished, black QPQ finish. Includes steel key. 9 oz. (255g). Weight: 6.75 oz. with key installed.
Factory original, fire control parts keep your select-fire Colt M16/M4 shooting reliably, so you’ll be prepared to face intensive tactical operations with the confidence of knowing your weapon won’t let you down. These parts are precision engineered and manufactured to strict quality control standards from the finest materials for correct fit in your gun.
SPECS: Steel. Matte black finish.
Lightweight, stainless steel bolt carrier has significantly lower reciprocating mass than a standard mil-spec carrier for softer recoil impulse on competition rifles. Helps limit felt recoil to get you back on target for fast follow-up shots. Lightening cuts reduce weight without sacrificing strength, and the forward assist serrations have been omitted for competition use. Extra-wide carrier rails have extra bearing surface to improve bolt alignment and reduce wear. Comes with carrier key installed and staked, and features a dust cover notch. For best performance and to minimize impact wear, use only in rifles with J.P. Low-Mass Recoil Buffer, Speed Hammer, and Reduced-Power Spring Kit, all available separately
SPECS: 416 stainless steel, polished, black QPQ finish. Recommended for competition rifles only.
The Rubber City Armory Adjustable Gas Key enhances performance of low mass and standard mass GI systems without unnecessary disassembly. Gas flow is adjusted and maintained at the carrier with 2 set screws, one to adjust gas flow and one to lock it in place. Made from Pre-Hardened 4140: 28-32RC with radiused corners reducing sharp edges. 2 mounting bolts included.
SPECS: Made from Pre-Hardened 4140: 28-32RC.
VDI direct impingement full auto rated bolt carriers are compatible with mil-spec and non mil-sped upper receivers and associated components. This bolt carrier is machined to meet all MIL TDP specifications and is enhanced using LifeCoat treatment providing superior:
Our new Integral D.I. Carrier was designed from conception to improve the service life and durability of the direct impingement carrier. The VDI Integral DI Carrier eliminates the potential for carrier to key separation due to carrier key screws stripping, fracturing, or becoming un-staked. The new Integral carrier has a improved gas flow path with no obstructions or shelves for carbon to deposit and build on eliminating the potential for gas obstruction to seize the operation of your carrier.
SPECS: Carrier made of 8620 Steel.