ABC RIFLE COMPANY AR 9mm Luger 16in Nitride Barrel Upper Receiver w/Custom 15in M-LOK And Charging Handle 1-10 Twist A2 Style Muzzle Brake Nitride. The 16in 4150 CMV barrel with a 1:10 twist is ideal for precise reliable shooting in 9mm. A direct-blowback operating system keeps things simple and dependable and its compatible with both Colt and Glock-style lowers. Finished with a 1/2x28 steel A2 birdcage flash hider 8620 nitride-coated 9mm BCG mil-spec stamped ejection port cover forward assist and a forged 6061-T6 aluminum charging handle. Specifications for ABC RIFLE COMPANY AR 9mm Luger 16in Nitride Barrel Upper Receiver w/Custom 15in M-LOK And Charging Handle: Manufacturer: ABC RIFLE COMPANY Caliber: 9mm Luger Barrel Length: 16 in Barrel Twist Rate: 1-10 Muzzle Device: A2 Style Muzzle Brake Finish: Nitride Color: Black Gun Model: AR-15 Handguard Length: 15 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: AR Platform Package Contents: ABC RIFLE COMPANY AR 9mm Luger 16in Nitride Barrel Upper Receiver w/Custom 15in M-LOK And Charging Handle What firearm models does the manufacturer say ABC RIFLE COMPANY AR 9mm Luger 16in Nitride Barrel Upper Receiver w/Custom 15in M-LOK And Charging Handle is compatible with? The manufacturer says that ABC RIFLE COMPANY AR 9mm Luger 16in Nitride Barrel Upper Receiver w/Custom 15in M-LOK And Charging Handle is compatible with AR-15ABC RIFLE COMPANY UA9-ML15-BR16: AR 9mm Luger 16in Nitride Barrel Upper Receiver w/Custom 15in M-LOK And Charging Handle 1-10 Twist A2 Style Muzzle Brake Nitride Black