JP Enhanced Bolt™ - offers greater life expectancy while utilizing a standard configuration extractor. Does not include firing pin, firing pin retainer, or cam pin. Available for .223 (JPEB-223) for $124.95 and DPMS .308 (JPEB-308) for $174.95.
The material used in 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 8620-type bolts. SAE 9310 is the same type of steel used in the transmission gears of Formula One racecars, 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, this new bolt will accept standard extractors, pins and springs.
The JP Enhanced Bolt™ is standard equipment on all JP .223 and .308 rifles and uppers, and we highly recommend it as a complement to your JP High Performance Bolt Carriers or any rifle system. The .223 version of the bolt is compatible with any AR-15 platform using a Mil-spec bolt carrier and subcomponents. The .308 version 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).
JP Enhanced Bolt™ on left as compared to a Mil-Spec bolt on right.
.223 and .308 bolts are out of stock. Complete bolt completion kits for .223 and .308 are available just below.
The JP Low Mass Carrier works out nicely in the new type of civilian machined receivers that don’t have a forward assist. Although it doesn’t have the forward assist serrations, it functions in military type receivers as well. It just won’t allow the use of forward assist on the receiver. The dust cover functions normally.
You may be wondering why some of the stainless carriers appear black. This is due to a new state of the art surface finish for stainless called QPQ (Quench, Polish, Quench). This is a five-step process resulting in a rock hard surface with natural lubricity. Some want the bright polished look and that is available on the JPBC-3 Low Mass carrier, but not the JPBC-2 tactical carrier.
The JP LRP-07 has our large format AR-10 type Low Mass carrier. The JPBC-4 AR-10 low mass stainless bolt carrier is also finished in black QPQ hard coat for superior wear and natural lubricity. The JPBC-4 will also improve the sight recovery on the DPMS LR-308 or the Armalite AR10. However, it must be used with a DPMS LR-308 bolt assembly, firing pin, cam pin and firing pin retainer.
Do not attempt to use the JPBC-4 with the Armalite bolt assembly, firing pin or cam pin. Unlike the AR-15/M16 platform on which just about everything is cross compatible, each AR-10 type rifle such as the JP LRP-07, DPMS LR-308, Armalite AR-10, Knights SR-25 or Rock River AR-10 is inherently different with only limited cross compatibility of components. Always check compatibility anytime you order aftermarket accessories for AR-10 type rifles.JP Full Mass Operating System
For police tactical duty or any application where absolute reliability is the main criteria, use the FMOS™ or Full Mass Operating System with 416 stainless steel special design carrier that includes forward assist serrations and a dust cover notch. The bore of the JP stainless carriers has a roller burnished finish for frictionless operation with no chance of peeling chrome as in standard mil-spec carriers. The exterior bearing surfaces are hand polished. When properly lubricated, both systems make your rifle feel like it was cycling on ball bearings.
Both the JPBC-2 and the JPBC-3 feature a 100% increase in bearing surface for smoother operation and improved alignment and lower wear in the upper receiver. Both are M15 semi auto configuration in the rear with the mil-spec longer cocking pad in the front for best reliability. This is hands-down the best designed and highest quality general purpose carrier on the market. Sold as carrier with installed key.
JPBC-2A comes complete with black stainless carrier and JP enhanced bolt assembly.
Price is $225.95 for the JPBC-2 stripped bolt carrier group and $335.95 for the JPBC-2A complete bolt carrier group.
All stripped bolt carriers are out of stock. JPBC-2A complete bolt carrier groups are in stock. Low mass complete bolt carrier groups are in stock just below.
Polished Stainless Bolt Carrier Group w/o bolt Black Stainless Complete BCG with Bolt Assembly
JP Low Mass Polished Stainless and Black Stainless Carrier with key installed - machined from 416 stainless steel for optimum durability and longevity. Low mass carriers do NOT have forward assist serrations but do feature dust cover notch. Black Stainless is QPQ treated. 100% increase in bearing surface for smoother operation, improved alignment and lower wear in the upper receiver. Recommended for competition and recreational use. To further enhance the performance of the JP Low Mass Carrier in rifles, we recommend the use of the JP Low Mass Buffer (available Here.) Not for use in .308 AR-type rifles. Weight: 6.25oz with key installed. Options are the $225.95 JPBC 3 SP Low Mass Bolt Carrier without bolt (out of stock), the JPBC 3A black stainless, or the $335.95 JPBC 3 SPA, which is the complete enhanced bolt carrier group assembly in your choice of polished stainless or Black QPQ Stainless finish. In Stock.
JPBC-4A Stainless Steel Low Mass Bolt Carrier, complete
with bolt, for .308 - Complete bolt carrier assembly with JPBC-4 .308 Low
Mass Carrier and JPEB-308 JP EnhancedBolt™ with cam pin, firing pin and firing
BC-4A 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-4A complete bolt carrier assembly and its parts are compatible with the DPMS family of AR-10 products. 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. In Stock.
JPBC-4SPA - special polished low mass bolt carrier group assembly for .308 with JP enhanced bolt completion kit. Price is $479.95.