ABC RIFLE COMPANY AR9 9mm Luger Pistol Billet 4in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Flat Dark Earth. The 4in MLOK handguard from ABC Rifle Co pairs with a 4in 4150 CMV barrel featuring a 1:10 twist for dependable accuracy. A direct-blowback action ensures simplicity and strength compatible with both Colt and Glock style lowers. The 7075 aluminum flash can redirects blast forward while the 8620 nitride-finished 9mm BCG keeps the action smooth. Finished with a steel ejection port cover and forged mil-spec charging handle for rugged reliability. Specifications for ABC RIFLE COMPANY AR9 9mm Luger Pistol Billet 4in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle: Manufacturer: ABC RIFLE COMPANY Caliber: 9mm Luger Barrel Length: 4 in Barrel Twist Rate: 1-10 Threads per Inch: 1/2x36 Muzzle Device: Muzzle Diverter Flash Can Finish: Cerakote Handguard Length: 4 in Gun Rail: M-LOK Gun Type: Pistol 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 Pistol Billet 4in 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 Pistol Billet 4in 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 Pistol Billet 4in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle is compatible with AR-9ABC RIFLE COMPANY UA9B-BR4-MLBC4-FDE: AR9 9mm Luger Pistol Billet 4in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Flat Dark Earth