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JP Rifles Polished Stainless Steel Full Mass Melonited Bolt Carrier Group For AR15 Style 5.56 / .223 Rifles

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$369.95
Complete Bolt Carrier Group
Item Id: JPBC-2A
In Stock

Included items
  • Melonited Polished Stainless Steel bolt carrier
  • Enhanced Bolt™ made from SAE 9310 high-grade steel
  • Mil-spec gas key
  • Mil-spec firing pin
  • Mil-spec cam pin
  • Mil-spec retaining pin

JP Rifles Stainless Steel Full Mass Bolt Carrier
You may be wondering why the stainless carriers appear black. This is due to a new state of the art surface finish for stainless called Melonite or QPQ (Quench, Polish, Quench). This is a specialized type of nitrocarburizing case hardening that increases:
  • corrosion resistance
  • wear resistance
  • lubricity
  • fatigue strength

JP Enhanced 9310 Bolt™ Assembly

The JP Complete Bolt Carrier Group includes the JP Enhanced 9310 Bolt™ Assembly with standard extractor. The standard Mil-spec C-158 (Carpenter 158) bolt has a number of factors limiting its performance, not the least of which is that the life expectancy of such bolts is only about 6,000 rounds. In fact, standard bolts will start to show stress cracks on the locking lugs adjacent to the extractor cut after only 3,000 rounds. Cracking at the cam pin hole and weak extractor spring tension only add to the problems of the Mil-spec bolt. The material used in these standard bolts is also not the best choice by today's standards, but if you remember the old story that explains why “Mil-spec never dies,” that applies here as well; they make them this way because they’ve always made them this way.

The latest edition JP Enhanced Bolt™ is made from SAE 9310 high-grade steel. This material makes for an extremely hard surface with a tough, ductile core resistant to structural failure and a life expectancy far exceeding Mil-spec C-158 bolts. SAE 9310 is the same type of steel used in the transmission gears of Formula One race cars, and the high-load application of a bolt assembly is ideal for this state-of-the-art material; the results of actual full-auto endurance torture tests prove it.

The design of the JP Enhanced Bolt™ addresses many other fine points, the most important of which is the utilization of a standard configuration extractor. Most users want the ability to replace extractors and other parts with commonly available mil-spec parts instead of being dependent on proprietary parts that can be difficult to acquire. Therefore,
the latest edition of the JP Enhanced Bolt™ accepts standard extractors, pins and springs.



JP Enhanced Bolt™ on left as compared to a mil-spec variety on right.



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Made in the USA Made in USA

California Proposition 65 Warning: this product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information visit https://www.p65warnings.ca.gov.

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