Sigwo Arms MIL-SPEC BCG 5.56/.300BLK by CMMG
Bolt Carrier Group, M16
Complete Mil-Spec M16 bolt carrier group for 5.56mm/.223 and 300 BLK.
- Bolt: 9310 Steel, Phosphate Finish
- Carrier: 8620 Steel, Chrome Lined, Phosphate Finish
- Extractor: 4140 Steel, Phosphate Finish