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JP High-Pressure EnhancedBolt™ Bolt AssemblyCaliber .308 Win. caliberFinish Chromium Nitride This bolt assembly 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. This bolt uses a specialized firing pin that is not compatible with other bolts nor can it use standard .308 firing pins.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.