49/64-20 tpi
Alexander ArmsAlexander Arms KIT50 Upper Parts Kits 50 Beowulf 16" Black Barrel, Aluminum Black Receiver for AR-15Add to cartAR15 UppersAlexander Arms KIT50 Upper Parts Kits 50 Beowulf 16″ Black Barrel, Aluminum Black Receiver for AR-15
$684.00 Add to cartAlexander Arms KIT50 Upper Parts Kits 50 Beowulf 16″ Black Barrel, Aluminum Black Receiver for AR-15