Replacement firing pin, retaining pin, and cam pin for Mk57 firearms. Specifications for CMMG Mk57 5.7X28mm Bolt Carrier Maintenance Kit: Manufacturer: CMMG Gun Make: CMMG Gun Model: CMMG Mk47 Package Contents: CMMG Mk57 5.7X28mm Bolt Carrier Maintenance Kit Mk57 (5.728) Firing Pin Firing Pin Retaining Pin Mk57 Cam Pin
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