Alexander Arms AR15 Stripped Rifle Upper, .50 Beowulf, 16 in Barrel, Carbine Length, 1-20 Twist, 49/64x20 Thread, Thread Protector, Black, KIT-50

"Alexander Arms AR15 Stripped Rifle Upper, .50 Beowulf, 16 in Barrel, Carbine Length, 1-20 Twist, 49/64x20 Thread, Thread Protector, Black, KIT-50. The Upper Receiver Built Kit comes with all the key components making it an excellent choice for a home build.