Battle Arms Development Bolt Carrier Group BCG AR-15/M16 Full-Auto ArmorTI Coating Titanium Black. This carrier fills the space of an M16 profile while reducing weight substantially. Aerospace surface treatment provides ultimate durability and wear resistance. Bolt material 9310 Billet gas key torqued and staked. Tool steel extractor and cam pin Weight 7.8oz Specifications for Battle Arms Development AR-15/M16 Titanium Bolt Carrier Group (BCG): Manufacturer: Battle Arms Development Color: Black Carrier Material: 8620 Steel Bolt Material: 9310 Steel Gun Make: AR Platform Gun Model: M16 AR-15 Weight: 7.8 oz Condition: New Package Contents: Battle Arms Development AR-15/M16 Titanium Bolt Carrier Group What firearm models does the manufacturer say Battle Arms Development AR-15/M16 Titanium Bolt Carrier Group (BCG) is compatible with? The manufacturer suggests that Battle Arms Development AR-15/M16 Titanium Bolt Carrier Group (BCG) is compatible with AR-15 M16Battle Arms Development BAD-BCG-M16-TI: Bolt Carrier Group AR-15/M16 Full-Auto ArmorTI Coating Titanium Black