JP Enterprises Small Frame Variable Mass Bolt Carrier Group BCG With Jpeb-223 Enhanced Bolt Black JPBC-6HA
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From OpticsPlanet
JP Enterprises Small Frame Variable Mass Bolt Carrier Group BCG With Jpeb-223 Enhanced Bolt Black JPBC-6HA. 223/5.56 Bolt Jpcp-223 Enhanced Cam Pin Jpfprp-223 Enhanced Firing Pin Retaining Pin. 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 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.