Home / Bolt Carrier Groups / Cmmg / Mk57 Complete Bolt Carrier Group Repair Kit - Mk57 Complete Bolt Carrier Group Repair Kit 5.7x28mm
Mk57 Complete Bolt Carrier Group Repair Kit - Mk57 Complete Bolt Carrier Group Repair Kit 5.7x28mm
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Aug 26, 2026
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Needing some replacement parts for your Bolt Carrier Group? No worries, CMMG has you covered! Each Bolt Carrier Group Repair Kit comes with the following items: Bolt - 5.7x28mm Firing Pin Firing Pin Retainer Pin Key (RDB) Key Screw X 2 Bolt Cam Pin Extractor Ejector Ejector Spring Bolt Spring (RDB) Mfg: Cmmg
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