J P Enterprises AR15 6.5 Grendel/ 6mm ARC Complete Bolt Assembly JPBC-EB6.5G

The JP Enterprises AR-15 6.5 Grendel / 6mm ARC Complete Bolt Assembly Enhanced (JPBC-EB6.5G) is a precision-machined, enhanced bolt assembly built from SAE 9310 nickel-chromium-molybdenum steel — the same high-strength alloy used in Formula 1 transmission gears. This is a Grendel Type II (SAAMI spec) bolt designed to fit AR-15 platforms chambered in 6.5 Grendel or 6mm ARC. The ultra-strong SAE 9310 steel provides a tough, ductile inner core that resists stress fracturing, with a hard outer surface that resists galling and wear — delivering a rated service life of up to 60,000 rounds, up to 10 times longer than a standard mil-spec carbon steel bolt. Made in the USA by JP Enterprises.

JP Enterprises has meticulously machined radiuses on all 90-degree corners on the locking lugs to distribute impact force evenly, further reducing the risk of premature wear and cracking. The fully supported extractor face and precise extractor engagement ensure smooth, reliable cycling across 6.5 Grendel and 6mm ARC loads. Each bolt is MPI (Magnetic Particle Inspected) and HPT (High Pressure Tested) for maximum reliability. Features a DLC (Diamond-Like Carbon) black finish for superior surface hardness and corrosion resistance. Bolt Shroud Depth: .140” nominal (SAAMI/Type II spec). Fully assembled with extractor, gas rings, ejector, pins, and springs installed — ready to drop in.

Ideal for precision AR-15 builds, PRS/NRL competition shooting, long-range hunting, or any high-demand application including sustained full-auto fire. An essential upgrade for any serious 6.5 Grendel or 6mm ARC build.

• Part Number: JPBC-EB6.5G
• Compatible Calibers: 6.5 Grendel (Type II / SAAMI), 6mm ARC
• Material: SAE 9310 nickel-chromium-molybdenum steel
• Finish: DLC (Diamond-Like Carbon), Black
• Service Life: Up to 60,000 rounds
• Testing: MPI (Magnetic Particle Inspection) & HPT (High Pressure Test)
• Performance: Up to 10x longer service life vs. standard carbon steel bolts
• Bolt Shroud Depth: .140” nominal
• Included: Fully assembled with extractor, gas rings, ejector, pins, and springs
• Platform: AR-15
• Country of Origin: Made in USA
• Best For: Custom AR-15 builds, PRS/NRL competition, long-range hunting, sustained fire