| Platform | Mk57 |
| Caliber | 5.7x28mm |
| Operating System | Radial Delayed Blowback |
Expected to ship within 15-30 business days. AR Parts Notice - State/local restrictions may apply in CT, DC, IL, MA, NJ, NY, or WA. Customers must review our Shipping Policy prior to ordering.
Parts Kit, Bolt Carrier Maintenance, Mk57, 5.7x28mm
Replacement firing pin, retaining pin, and cam pin for Mk57 firearms.
Kit Includes:
- Mk57 (5.7×28) Firing Pin
- Firing Pin Retaining Pin
- Mk57 Cam Pin