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- 4140 Steel gas key DLC Coated
The bolt is 5
9310 Arc-Vac Steel 7
- Gas key staked to Mil-Spec Standards
Tool Steel Extractor Nitride QPQ
M16 5.56/223 Bolt Carrier Group Nickel Boron bcgcomponents - 4140 Steel gas keyThis is our standard Nickel Boron Coated Bolt Carrier Group for the 5. 56. . 223 caliber. We use a 9310 Vac Arc steel Bolt over the Mil Spec Carpenter 158 Bolt because it's stronger and after many test firings and torture tests we've found it to not only last longer but to be more durable. The Nickel Boron coating has a Rockwell hardness between 52 56. This Bolt Carrier Group comes fully assembled and ready to drop into your rifle. AR15 and M16
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