JP VMOS Aluminum Variable Mass Bolt Carrier AR-10, Large Frame (308)

Like our small-frame JPBC-1, this carrier is the ultimate game gun operating system, now available for your heavy metal rig. The JPBC-8 offers an extremely light recoil impulse with minimal sacrifice in reliability. The JPBC-8 also pulls from the advances of our JPBC-7 Variable Mass Carrier. This standard version of the aluminum large-frame VMOS™ carrier includes three steel weights, two of which can be exchanged for heavier tungsten weights. Requires DPMS-pattern bolt, firing pin and cam pin. This carrier also includes our Enhanced Gas Ring for perfect gas seal and a low-friction relationship between ring and carrier bore. Package includes carrier, titanium firing pin, JP Enhanced Gas Ring and instruction sheet. Patent Pending Features: Enhanced tunability of operating system Faster sight recovery and follow-up shots Increased bearing surfaces for slower wear and longer component life Longer Mil-spec cocking pad for optimal reliability Included Enhanced Gas Ring provides perfect bore-to-gas seal fitment and minimized friction/carrier wear Included titanium firing pin eliminates possibility of slamfires at higher bolt velocities Full-length forward assist serrations American made