GunTec AR9 Bolt Carrier Group Features The GunTec AR9 Bolt Carrier Group is purpose built for 9mm AR9 pattern rifles using 8620 steel for the carrier body and a 9310 steel bolt for strength where it matters most. Both components are fully heat treated giving the group the durability needed to withstand the high cycle rates typical of blowback operated 9mm AR builds. An external extractor design keeps extraction reliable across a range of 9mm ammunition. The mil-spec dimensions ensure the carrier group drops into standard AR9 upper receivers without fitting issues. A QPQ salt bath nitride finish is applied to the carrier group providing excellent corrosion resistance and a slick surface that reduces friction during cycling. The carrier group is compatible with both Glock and Colt style lower receiver magazine wells covering the two most common AR9 magazine standards. Dust cover compatibility allows the completed upper to retain the clean finished look of a standard AR-15 pattern rifle. Made in the USA the GunTec AR9 Bolt Carrier Group gives builders a dependable core component for their 9mm AR9 project. Guntec AR9 Bolt Carrier Group Specifications Manufacturer: GunTec Model: AR9 Bolt Carrier Group Compatible Hosts: AR9 (Glock/Colt Style Lowers) Material: 8620 Steel Carrier 9310 Steel Bolt Finish: QPQ Nitride Other Features: External Extractor Dust Cover Compatible Made in USA Caliber: 9mm Available At: GrabAGun