Alexander Arms Pistol Upper Receiver 50 Beowulf 12" Barrel, Black - ALEX USB50

Complete upper receiver assembly for the 50 Beowulf cartridge featuring a 12-inch barrel with 1:20 twist rate and carbine-length A2-type handguard. Direct impingement operating system with flat-top receiver and 49/64-20 TPI threaded muzzle. Compatible with any standard-specification lower receiver; intended for use with registered SBR or Class III lower receivers per NFA regulations.