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JP Low Mass BCG Stainless (JPBC-3A) with key installed. Machined from 416 stainless steel for optimum durability and longevity. Does NOT have forward assist serrations but does feature dust cover notch. 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, we recommend the use of the JP Low Mass Buffer. Finished with a QPQ hardcoat process to yield incredibly hard and lubricious bearing surfaces. Not for use in .308 AR-type rifles. Weight: 6.25oz with key installed. JP EnhancedBolt™ with standard extractor, .223/5.56 caliber. The .223 version of the bolt is compatible with any AR-15 platform using a Mil-spec bolt carrier and subcomponents.