ARMALITE AR15/M16 Chrome lined Bolt Carrier

Original ArmaLite® Bolt Carrier, auto version, for AR15, M16, M4 firearm upgrades or new premium builds. Chrome lined Bolt Carrier and Chrome lined Gas Carrier, machined from the correct Mil-Spec Carpenter No. 158® steel and machined to original USGI specifications. Specifications: For caliber: .223 Rem/5.56 Nato/.300 AAC Blackout Compatible to M15/AR-15/M4/M16 models Spec: Auto Profile Chrome lined Bolt Carrier Chrome lined Gas Key Machined to USGI specifications Made from No. 158® Steel Finish: Mil-Spec phosphate coating Gas Key with Grade 8 fasteners with a Torque from 55 inch lbs Gas Key properly staked per Mil-Spec Specifications Heat treated Forward Assist Serrations 100% Made in the USA