Angstadt Arms' UDP-9 Pistol utilizes a 7075-T6 billet aluminum receiver with appropriately sized ejection port and no forward assist or dust cover. The Angstadt Arms 5.5" free-float M-LOK hand guard features a seven (7) side design that allows for 45 degree offset mounting options and a mil-spec 1913 Picatinny rail. Its barrel is chrome moly with black melonite finish, A2 style flash suppressor, and 1/2x28 threads.