OpticsPlanet
JP Enterprises Bolt Carrier Assembly Large Frame Heavy Variable Mass Carrier Enhanced High Pressure Bolt Black JPBC-7AH2HP
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From OpticsPlanet
JP Enterprises Bolt Carrier Assembly Large Frame Heavy Variable Mass Carrier Enhanced High Pressure Bolt Black JPBC-7AH2HP. This is especially true in the absence of an adjustable gas block. Residual gas and excessive fouling can grind your rifle to a stop. One size never fits all when it comes to gas-operated rifles. The Variable Mass Operating System (VMOS) carrier ensures reliability through additional reciprocating mass but provides more custom tunability. Combined with our Silent Captured Spring multiple masses are exchangeable to perfectly tune your operating system weight.