JP Enterprises Bolt Carrier Assembly, Large Frame Variable Mass Carrier, Black, JPBC-7AH2

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.

Features/Specifications:

Features (bolt carrier):

Enhanced tunability of operating system

Guaranteed reliability of difficult configurations

Overcomes heavy fouling build-up

Near total elimination of bolt bounce

Roller-burnished bore for frictionless operation

Rock-hard QPQ finish provides remarkable natural lubricity

Extremely smooth cycling with proper lubrication

Increased bearing surfaces for slower wear and longer component life

Longer cocking pad for optimal reliability

Features (bolt):

SAE 9310 steel construction for superior resiliency and extended lifespan

DLC coating provides extreme surface hardness and lubricity while maintaining a ductile core

Near frictionless surface finish

Fully compatible with Mil-spec sub-components

Improved lug geometry for reduced wear and easier locking/unlocking

Enhanced Ejector mitigates head case extrusions and reduces brass smear

Enhanced Extractor optimizes extraction function and eliminates common ejection failures

Enhanced Gas Ring reduced internal friction and carrier wear while maintaining near indefinite gas seal

Reliable function with over-pressured loads such as 6.5mm and 6mm calibers (HP bolt)

Virtually eliminates primer flow and pierced primes (HP bolt)

Reduced firing pin mass improves lock time and ignition reliability (HP bolt)

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

• Features (bolt carrier):
• Enhanced tunability of operating system
• Guaranteed reliability of difficult configurations
• Overcomes heavy fouling build-up
• Near total elimination of bolt bounce
• Roller-burnished bore for frictionless operation
• Rock-hard QPQ finish provides remarkable natural lubricity
• Extremely smooth cycling with proper lubrication
• Increased bearing surfaces for slower wear and longer component life
• Longer cocking pad for optimal reliability
• Features (bolt):
• SAE 9310 steel construction for superior resiliency and extended lifespan
• DLC coating provides extreme surface hardness and lubricity while maintaining a ductile core
• Near frictionless surface finish
• Fully compatible with Mil-spec sub-components
• Improved lug geometry for reduced wear and easier locking/unlocking
• Enhanced Ejector mitigates head case extrusions and reduces brass smear
• Enhanced Extractor optimizes extraction function and eliminates common ejection failures
• Enhanced Gas Ring reduced internal friction and carrier wear while maintaining near indefinite gas seal
• Reliable function with over-pressured loads such as 6.5mm and 6mm calibers (HP bolt)
• Virtually eliminates primer flow and pierced primes (HP bolt)
• Reduced firing pin mass improves lock time and ignition reliability (HP bolt)

Package Contents:

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