CMMG Parts Kit Bolt Maintenance Mk4 5.56Mm. . Developed by using several of the most durable and dependable components available these Bolt Carrier Groups via CMMG offers you something that will give you numerous years of dependability. CMMG has been developing high-quality merchandise for a very long time and the CMMG Parts Kit Bolt Maintenance is their manner of showing you just how much they care. Here at OpticsPlanet we ensure that it is our obligation to purchase the best solution for all of your preferences and featuring the CMMG Parts Kit Bolt Maintenance is one thing that we're happy to offer. Specifications for CMMG Parts Kit Bolt Maintenance: Manufacturer: CMMG Caliber: 5.56mm Package Contents: CMMG Parts Kit Bolt Maintenance Extractor AR15 Spring Extractor AR15 Buffer Extractor AR15 Pin Extractor M16 Ejector AR15 Roll Pin Ejector 1/16" x 3/8" AR15 Spring Ejector/Selector Detent AR15 Gas Ring Helical AR15 CMMG 55AFF56: Parts Kit Bolt Maintenance Mk4 5.56Mm