| Platform | Mk57 |
| Caliber | 5.7x28mm |
| Operating System | Radial Delayed Blowback |
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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**