JP Enterprises LARGE FRAME VMOS™ Bolt Carrier Group with JP EnhancedBolt™
.308 | .308 HP
Stainless Steel
QPQ Black Finish
Standard VersionCycling problems? The JP Enterprises LARGE FRAME VMOS™ brings the discipline your rifle needs.
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 standard version of the JP Enterprises LARGE FRAME VMOS™ carrier includes three steel weights, two of which can be exchanged for heavier tungsten 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.
Patent Pending
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
- Chromium nitride PVD coating provides extreme surface hardness 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)
WARNING:
The JP .308HP bolt does not allow for the use of excessive pressure, overloaded ammunition that exceeds SAAMI specifications. When evaluating new ammunition, always start on the low- to mid-range of any published load data and work up. A good indicator of working pressure is the primer retention on the subsequent loading of a case. A noticeable loss of primer pocket tension indicates that your ammunition has excessive pressure and has overworked the case.
Compatibility:
This notice pertains to any rifle based on the large-format AR-10-type or LR-308 platform typically chambered in .308 Winchester, 7.62×51 NATO or other cartridges requiring the longer magazine format.
Be aware that these receiver platforms are not standardized like the AR-15/M16 platform for which most parts are cross-compatible. Before ordering accessories and parts for your large-format rifle, make sure the parts are compatible with your particular platform. This bolt carrier group is compatible only with the DPMS family of AR-10 products.
With the Armalite/Rock River family of large-frame receivers, this carrier can only be used as a complete bolt carrier assembly group with a DPMS-pattern bolt such as our .308 JP EnhancedBolt. Interchanging individual components will result in an unsafe configuration. Do not under any circumstances mix and match components between the platforms.
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