- Large Frame .308/7.62
- LOW Mass Operating System (LMOS)
- Does NOT include forward assist serrations
- Melonite QPQ (Quench Polish Quench) finish
The JPBC-4 is a premium bolt carrier for the DPMS patterned large frame rifles. The Low Mass Operating System (LMOS) allows your rifle to cycle quicker & with less recoil than a standard mass bolt carrier group. The Melonite QPQ finish and the enlarged bearing surfaces provide for a very smooth and reliable action. The bore of the JP stainless carriers has a roller burnished finish for frictionless operation with no chance of peeling chrome as in standard mil-spec carriers. The exterior bearing surfaces are hand polished. When properly lubricated, both systems make your rifle feel like it was cycling on ball bearings.
A note from JP Enterprises on Compatibility
This notice pertains to any rifle based on the large-format AR-10-type or LR-308 platform typically chambered in .308 Winchester, 7.62x51 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.
For more info, visit JP Enterprises