Bear Creek Arsenal BC-15 .450 Bushmaster 18in Upper Receiver Heavy Mid 1-24 Twist 5/8x32 Flash Hider Parkerized Tungsten

Bear Creek Arsenal BC-15 .450 Bushmaster 18in Upper Receiver Heavy Mid 1-24 Twist 5/8x32 Flash Hider Parkerized Tungsten. 450 Bushmaster upper is compatible with any mil-spec AR-15 lower. Magazine not included. Specifications for Bear Creek Arsenal BC-15 .450 Bushmaster 18in Upper Receiver: Manufacturer: Bear Creek Arsenal Caliber: .450 Bushmaster Barrel Length: 18 in Barrel Profile: Heavy Gas System Length: Mid Length Barrel Twist Rate: 1-24 Firearms Threads Per Inch: 5/8x32 Muzzle Device: Flas