Bear Creek Arsenal BC-15 7.62x39 16in Upper Receiver Heavy Carbine 1-10 1/2x28 Flash Hider Parkerized Tungsten. 62x39 upper is compatible with any mil-spec AR-15 lower. Featuring a 7.62x39 enhanced firing pin for increased reliability for steel cased ammo and upgraded bolt. Shop more 7.62 x 39 Uppers Magazine not included. Specifications for Bear Creek Arsenal BC-15 7.62x39 16in Upper Receiver: Manufacturer: Bear Creek Arsenal Caliber: 7.62x39mm Barrel Length: 16 in Barrel Profile: Heavy Gas System Length: Carbine Length Barrel Twist Rate: 1-10 Muzzle Device: Flash Hider Finish: Parkerized Gun Model: AR-15 Handguard Length: 15 in Gun Rail: M-LOK Gun Make: AR Platform Weight: 5.5 lb Flutes: No Package Contents: Bear Creek Arsenal BC-15 7.62x39 16in Upper Receiver What firearm models does the manufacturer say Bear Creek Arsenal BC-15 7.62x39 16in Upper Receiver is compatible with? The manufacturer says that Bear Creek Arsenal BC-15 7.62x39 16in Upper Receiver is compatible with AR-15Bear Creek Arsenal UAFC4003762CHB1611015TNGSR: BC-15 7.62x39 16in Upper Receiver Heavy Carbine 1-10 1/2x28 Flash Hider Parkerized Tungsten