CMMG Mk57 5.7x28mm Complete BCG Repair Kit

Complete BCG Repair Kit For Mk57 5.728. Specifications for CMMG Mk57 5.7x28mm Complete BCG Repair Kit: Manufacturer: CMMG Cartridge: 5.7x28mm Gun Make: CMMG Package Contents: CMMG Mk57 5.7x28mm Complete BCG Repair Kit Bolt 5.7x28mm Firing Pin Firing Pin Retainer Pin Key (RDB) Key Screw X 2 Bolt Cam Pin Extractor Extractor Buffer & Spring Ejector Ejector Spring Bolt Spring (RDB) Roll Pins