The JP Enterprises High Pressure EnhancedBolt Completion Group in .308 Win. (JP part no. JPBC-EB308HP) pairs JP’s strengthened bolt with the parts needed to finish a bolt assembly. The kit includes the bolt assembly, firing pin, cam pin and retainer pin. JP built the high pressure bolt to cut primer flow and pierced primers, with a smaller firing pin orifice that fits a low-mass firing pin. It is cut from SAE 9310 steel, carries a black DLC coating and comes with JP’s lifetime bolt warranty.

Key Specifications

• The caliber is .308 Win., so this bolt is for large-frame builds.
• The material is SAE 9310 steel, a stronger alloy than the Carpenter 158 steel used for standard Mil-spec bolts.
• The finish is black DLC, a hard coating with high durability and lubricity.
• The firing pin orifice is reduced in diameter to fit the .062-inch tip of JP’s low-mass firing pin, which limits primer flow.
• The kit contains the bolt assembly, firing pin, cam pin and retainer pin, the parts needed to complete the bolt.

Frequently Asked Questions

What problem does the high pressure bolt solve? JP says it reduces primer flow and pierced primers, and its modified ejector helps with case head extrusion and brass shavings.

Does it let me run over-pressure ammunition? No. JP states that the .308HP bolt does not allow the use of overloaded ammunition that exceeds SAAMI specifications, and recommends starting at the low to mid range of published load data and working up.

What is included? The completion group includes the bolt assembly, firing pin, cam pin and firing pin retainer pin.

Buy the JP Enterprises High Pressure EnhancedBolt Completion Group, .308 Win

If primer flow or ejector smear has been a problem in your .308 AR, a high pressure bolt is the targeted fix. Browse more parts in our other AR-15 accessories and parts section and order from our Lubbock, Texas gun shop for fast, insured shipping.