JP Enterprises Full Mass Bolt Carrier - $393.99 Full Mass Operating System 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

JP Enterprises EnhancedBolt Bolt Carrier Group, 9mm, Polished SS Finish, Standard Stroke Enhanced SCS System - 2 Tungsten/ 3 Steel Masses, Silver - $387.99 Enhanced 9mm AR Bolt, combined with a Silent Captured Spring System.New to this revision of our JPBC-9SL and JPBC-9SL-SP bolt assemblies is last

JP Enterprises Small Frame Variable Mass Bolt Carrier Group With Jpeb-223 Enhanced Bolt, Black - $354.99 Complete Bolt Carrier Group Including Jpbc-6H Vmos Carrier, Jpeb-223 Enhanced .223/5.56 Bolt, Jpcp-223 Enhanced Cam Pin, & Jpfprp-223 Enhanced Firing Pin Retaining Pin. For difficult setups like

JP Enterprises Bolt Carrier Assembly, Large Frame Heavy Variable Mass Carrier, Enhanced High Pressure Bolt, Black - $497.99 For difficult setups like suppressed rifles and exotic caliber chamberings, some degree of mass regulation is required for optimal performance. This is especially true in the