Complete bolt carrier assembly with JPBC-4SP polished stainless .308 Low Mass Carrier and JPEB-308HP JP High Pressure EnhancedBolt™, cam pin, firing pin and firing pin retainer.

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.

Package Includes:

• JP bolt carrier
• JP EnhancedBolt (.308)
• Cam pin
• Firing pin
• Firing pin retainer pin
  
  BC-4 Bolt Carrier Assembly Group AR-10 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. The JPBC-4AHP complete bolt carrier assembly and its parts are compatible with the DPMS family of AR-10 products.
  
  NOTICE: With the Armalite/Rock River family of large-frame receivers, this assembly can only be used as a complete bolt carrier assembly group. Interchanging individual components will result in an unsafe configuration. DO NOT under any circumstances mix and match components between the platforms. Only use the complete JP bolt carrier assembly in the Armalite/Rock River platforms.