- Complete Mil Spec M16 bolt carrier group
- Extractor is 4140 Steel, Phosphate Finish
- Carrier is 8620 Steel, Chrome Lined, Phosphate Finish
This CMMG 5.56 Bolt Carrier Group, Black (55BA419) is a replacement part that fits M16 OR 556 model gun, and comes in black.
|Bolt||9310 Steel, Phosphate Finish|
|Carrier||8620 Steel, Chrome Lined, Phosphate Finish|
|Extractor||4140 Steel, Phosphate Finish|