ABC RIFLE COMPANY AR 9mm Luger 16in Barrel Slim M-LOK Upper Receiver w/BCG And Charging Handle 1-10 Twist A2 Style Muzzle Brake Nitride Black. Built around a 7075-T6 forged aluminum upper receiver it features a 15in M-LOK handguard from ABC Rifle Co machined from 6061-T6 aluminum for lightweight strength. The 16in 4150 CMV barrel has a 1:10 twist and operates via direct-blowback optimized for both Colt and Glock style lowers. A 1/2x28 A2 birdcage flash hider is included. The 8620 steel 9mm bolt carrier group is nitride finished for longevity. Complete with a milspec forward assist ejection port cover and forged aluminum charging handle. Specifications for ABC RIFLE COMPANY AR 9mm Luger 16in Barrel Slim M-LOK Upper Receiver w/BCG 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 Handguard Length: 15 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: AR Platform Last Chance: Yes Package Contents: ABC RIFLE COMPANY AR 9mm Luger 16in Barrel Slim M-LOK Upper Receiver w/BCG And Charging Handle ABC RIFLE COMPANY UA9-TRML15-BR16: AR 9mm Luger 16in Barrel Slim M-LOK Upper Receiver w/BCG And Charging Handle 1-10 Twist A2 Style Muzzle Brake Nitride Black