CMMG Parts Kit, Complete BCG Repair, Mk57, 5.7x28mm

Parts Kit, Complete BCG Repair, Mk57, 5.7x28mm

Complete BCG Repair Kit For Mk57 5.7×28

Comes With Following Parts:

• 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

**Image may not show correct caliber, but parts in kit are for 5.7x28mm**