| PLATFORM | MK4 |
| CALIBER |
.300 BLK, .350 LEGEND, 5.56MM
|
Bolt Assembly, AR15
M16 bolt assembly. Ejector, Extractor, and Gas Rings pre-installed.
- Bolt: 9310 Steel, Phosphate Finish
- Extractor: 4140 Steel, Phosphate Finish
All CMMG products come with our Lifetime Quality Guarantee.
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