Angstadt Arms UDP-9 Complete AR-15 Upper 9mm 6" Barrel Angstadt Arms Complete Upper Receiver Pistol Assembly Is Ready With Any 9mm AR-15 Lower Receiver. Featuring The Same High Quality Parts That Go Into The UDP-9 Pistol, This Completed Upper Receiver Is Compatible With Both Glock And Colt Style 9mm magazines. Caliber: 9mm Barrel Length: 6" Barrel Material: 7075-T6 Aluminum Twist: 1:10"
