- Enlarged barring surfaces
- JPBC-2 Full mass bolt carrier
- Durable qpq finish
- Includes forward assist serrations
- Weight: 8.82 oz.
6.5 Grendel Bolt
- Chromium Nitride finished
- SAE 9310 steel (extends the lifetime of bolt)
- Superior lug geometry for exceptional lock-up
- Enhanced ejector
- Enhanced extractor
- 10.8 oz.
Compatible with any standard Mil-Spec upper! This bolt carrier is for any application where absolute reliability is the main criteria, 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 friction-less 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. The JP EnhancedBolt 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 race cars, 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.