| Platform | Mk4 |
| Caliber | 5.56x45mm |
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Parts Kit, Bolt Maintenance, Mk4, 5.56MM
Kit includes:
- Extractor, AR15
- Spring, Extractor, AR15
- Buffer, Extractor, AR15
- Pin, Extractor, M16
- Ejector, AR15
- Roll Pin, Ejector, 1/16" x 3/8", AR15
- Spring, Ejector/Selector Detent, AR15
- Gas Ring, Helical, AR15