GC_UPC Alexander Arms AR15 Stripped Rifle Upper, .50 Beowulf, 16 in Barrel, Carbine Length, 1-20 Twist, 49/64x20 Thread, Thread Protector, Black, KIT-50 $749.99 KIT50 show more like this Free Shipping on most orders over $49 Optics Planet GC_UPC Alexander Arms Upper Receiver Build Kit AR-15 50 Beowulf 16.5 Barrel 1 in 20" Twist 49/64"-20 Thread with Thread Protector Black - 160328" $824.99 KIT-50 show more like this 12.75 MidwayUSA