Bolt Carrier Group M16Bolt: 9310 Steel, Phosphate Finish Carrier: 8620 Steel, Chrome Lined, Phosphate Finish Extractor: 4140 Steel, Phosphate Finish The M16 Bolt Carrier Group is a complete Mil Spec assembly designed for 5. 56mm . 223 and 300 BLK calibers. Crafted with high quality materials for enhanced durability and performance, the bolt is made from 9310 steel with a phosphate finish, while the carrier is constructed from 8620 steel with a chrome lined, phosphate
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