JP Enterprises Bolt Carrier Assembly, Large Frame Variable/Heavy Mass Carrier

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. Combined with our Silent Captured Spring, multiple masses are exchangeable to perfectly tune your operating system weight.

This heavy version of the large-frame VMOS carrier includes one steel and two tungsten weights, which can be exchanged for lighter steel weights.

This carrier group includes our proprietary bolt design, the JP EnhancedBolt. Superior in every way to standard bolts, it's manufactured from SAE 9310, providing drastically extended lifespan with design improvements that ensure superior function.

Our proprietary bolt design, the JP EnhancedBolt is superior in every way to a standard Mil-spec bolt. Manufactured from SAE 9310, it has a drastically extended lifespan while design improvements ensure superior function. This high pressure .308 model is designed to open up reliable function of AR platforms with over-pressured loads such as 6.5mm and 6mm calibers. This is achieved through use of a reduced diameter firing pin orifice that precisely accommodates the tip of the included low mass firing pin.

The EnhancedBolt is compatible with the JP LRP-07 and the DPMS LR-308 platforms (or clones thereof) only and cannot be used to replace bolts in the Armalite AR-10 platform (or clones thereof).

Requires DPMS-pattern bolt, firing pin and cam pin.

Package includes carrier, EnhancedBolt assembly, cam pin, firing pin, firing pin retainer pin and instruction sheet.