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Alibaba.com offers 838 bolt carrier group products. About 0% of these are Machining. A wide variety of bolt carrier group options are available to you, such as micro machining or not, cnc machining or not, and material capabilities.JP Enhanced Gas Rings reduce internal friction and wear of the bolt carrier while maintaining gas seal longer. Caliber: .223/5.56 Finish: Black DLC. $137.95. JPBC-EB6.5G. JP EnhancedBolt™ Assembly Completion Group. Caliber: 6.5 Grendel Finish: Black DLC.Prior to shipping, all BCM Bolt Carrier Groups are test fired for function. As such, the Bolt Carrier Group will show handling marks consistent with these quality control procedures. Item Nr.: 470-BCMBCG-FDE