ABC RIFLE COMPANY AR9 9mm Luger Rifle Billet 16in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Cerakote Olive Drab Green. The 16in 4150 CMV barrel with a 1:10 twist is optimized for accuracy and reliability. A direct-blowback system keeps things simple and rugged while compatibility with Colt and Glock-style lowers ensures broad versatility. Topped off with a 1/2x28 steel A2 birdcage flash hider a nitride 8620 9mm BCG mil-spec steel ejection port cover forward assist and a forged 6061-T6 aluminum charging handle. Specifications for ABC RIFLE COMPANY AR9 9mm Luger Rifle Billet 16in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle: Manufacturer: ABC RIFLE COMPANY Caliber: 9mm Luger Barrel Length: 16 in Barrel Twist Rate: 1-10 Threads per Inch: 5/8x24 Muzzle Device: Flat Top Muzzle Device Handguard Length: 13 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-9 Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Package Contents: ABC RIFLE COMPANY AR9 9mm Luger Rifle Billet 16in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle What firearm models does the manufacturer say ABC RIFLE COMPANY AR9 9mm Luger Rifle Billet 16in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle is compatible with? The manufacturer says that ABC RIFLE COMPANY AR9 9mm Luger Rifle Billet 16in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle is compatible with AR-9ABC RIFLE COMPANY UA9B-BR16-ML13-ODG: AR9 9mm Luger Rifle Billet 16in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Cerakote Olive Drab Green