JP Enterprises, FMOS Full Mass 556 Bolt Carrier

JP FMOS™ Bolt Carrier

For police duty or any application where absolute reliability is the main criteria, our 416 stainless steel Full Mass Operating System (FMOS™) carrier design is the top of the line. The JPBC-2 has every strength an operator expects from a Mil-spec. carrier matched up with improvements born from decades of shooting and engineering experience. Heavier than a standard .308 carrier, our large-frame JPBC-5 is the solution for rifle needing more mass regulation.

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, improved alignment and lower wear in the upper receiver as well as a longer Mil-spec. cocking pad for optimal reliability.

Just as critical as the design is the robust finishing process of the FMOS™ carrier, which receives a roller-burnish of its bore for frictionless operation, eliminating 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 that results in a rock-hard surface with remarkable natural lubricity. This is hands-down the best designed and highest quality general purpose carrier on the market, and when properly lubricated, a JP operating system will make your rifle feel like it's cycling on ball bearings.

• Small-Frame
• Stainless Steel
• QPQ Black Finish
• Weight: 8.82 oz. with key installed