ABC RIFLE COMPANY AR 9mm Luger 16in Barrel w/12in Quadrail Handguard Upper Receiver w/BCG And Charging Handle 1-8 Twist A2 Style Muzzle Brake Nitride. The 16in 4150 CMV barrel with a 1:10 twist delivers solid accuracy and the direct-blowback action ensures simple dependable cycling. Compatible with Colt and Glock-style lowers it features a 1/2x28 steel A2 birdcage flash hider up front and a nitride-finished 8620 9mm BCG at its core. Finished with a mil-spec ejection port cover forward assist and forged 6061-T6 aluminum charging handle. Specifications for ABC RIFLE COMPANY AR 9mm Luger 16in Barrel w/12in Quadrail Handguard Upper Receiver w/BCG And Charging Handle: Manufacturer: ABC RIFLE COMPANY Caliber: 9mm Luger Barrel Length: 16 in Barrel Twist Rate: 1-8 Muzzle Device: A2 Style Muzzle Brake Finish: Nitride Handguard Length: 12 in Gun Make: AR Platform Package Contents: ABC RIFLE COMPANY AR 9mm Luger 16in Barrel w/12in Quadrail Handguard Upper Receiver w/BCG And Charging Handle ABC RIFLE COMPANY UA9-QR12-BR16: AR 9mm Luger 16in Barrel w/12in Quadrail Handguard Upper Receiver w/BCG And Charging Handle 1-8 Twist A2 Style Muzzle Brake Nitride Black