KAK Industry Enhanced 9mm Bolt Carrier Group Features The KAK Industry Enhanced 9mm bolt carrier group uses a steel weighted carrier design engineered specifically for the demands of pistol caliber AR9 operation where cyclic timing differs significantly from a standard 5.56 blowback setup. The 8620 steel carrier body is matched with a 4130 steel gas key a component that keeps gas sealing consistent and reduces the chance of key loosening under repeated cycling. An 8740 steel firing pin rounds out the internals chosen for its strength and resistance to peening after extended rounds count. Together these materials give the carrier group the durability builders expect from a serious working part rather than a budget stand-in. Compatibility is a central feature of this carrier group since it is built to function with both Colt style and Glock style AR9 lower receivers and magazines covering the two most common magazine well configurations on the market. The black nitride finish applied to the carrier adds surface hardness and corrosion resistance while keeping friction low for smoother cycling over time. KAK Industry founded in 2011 by Kurt Kosman built its reputation on supplying American-made components at accessible prices without cutting corners on material quality. For an AR9 owner upgrading a factory carrier or finishing a custom build this bolt carrier group offers a straightforward reliable foundation for sale at GrabAGun. KAK Industry Enhanced 9mm Bolt Carrier Group Specifications Manufacturer: KAK Industry Model: Enhanced 9mm Type: Bolt Carrier Group Compatible Hosts: AR9 Colt and Glock Style Magazines Color: Black Finish: Nitride Material: 8620 Steel Carrier 4130 Steel Gas Key 8740 Steel Firing Pin Caliber: 9mm Available At: GrabAGun