JP AR10 FMOS BCG with JP Enhanced Bolt

JP AR10 FMOS BCG with JP Enhanced Bolt

$445.95 $423.66

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Availability: In stock SKU: JPBC-5A


JP AR10 FMOS BCG with JP Enhanced Bolt

JPBC-5A | Full Mass AR10 Bolt Carrier Group

JP AR10 FMOS BCG with JP Enhanced Bolt is for any application where absolute reliability is needed.  The 416 stainless steel Full Mass Operating System (FMOS) carrier design is the best of the best.  The JPBC-5A has every strength an operator expects from a Mil-spec. carrier.  Also, it is built upon improvements born from decades of shooting and engineering experience.  Because the JPBC-5A is heavier than a standard .308 carrier, it is the solution for rifle needing more mass regulation.

Since it is designed with extended forward assist serrations and a dust cover notch, our FMOS™ carriers also feature a 100% increase in bearing surface for smoother operation.  The improved alignment and lower wear in the upper receiver.  The JP AR10 FMOS BCG has a longer MIL-SPEC. cocking pad for optimal reliability.

Surface and Finish

Just as critical as the design is the robust finishing process of the FMOS carrier.  It receives a roller-burnish of its bore for frictionless operation.  Because of this, it eliminates the peeling chrome common to standard Mil-spec carriers. Then, the exterior bearing surfaces are polished before the carrier undergoes our state-of-the-art, multi-vendor QPQ (Quench-Polish-Quench) process.  This results in a rock-hard surface with great lubricity. This is hands-down the best designed and highest quality general purpose carrier on the market.  Lastly, when properly lubricated, a JP operating system will make your rifle feel like it’s cycling on ball bearings.

Arm or Ally carries the JP Silent Captured Spring.  Also, check out our extensive AR10 Barrel inventory.  If you need more parts or looking to upgrade your AR10, view our full line of AR10 Parts.  We are America’s new AR parts headquarters.

Additional Information

Manufacturer:  JP Enterprises
Part #:  JPBC-5A
Platform:  AR10
MSRP:  $445.95

Additional information

Weight 19 oz
Dimensions 10 × 2 × 2 in
Coating Type

Black Nitride


JP Enterprises

Part Type

Bolt Carrier Group



This notice pertains to any rifle based on the large-format AR-10-type or LR-308 platform typically chambered in .308 Winchester, 7.62×51 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 group 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.