The PM-63 RAK (Ręczny Automat Komandosów, "commandos' hand-held automatic") is a Polish open-bolt 9×18mm Makarov submachine gun, designed in 1950s. The weapon was accepted into service with the People's Army of Poland and police in 1965 as the 9 mm pistolet maszynowy wz. 1963 ("9 mm submachine gun model 1963") It has handgun-like ergonomics, reciprocating slide instead of internal bolt, an underfolding stock and a foldable vertical foregrip.
