The PM-84 Glauberyt is a Polish submachine gun. It is a personal weapon intended for combat and self-defense at ranges up to 150 m with single shot or fully automatic fire mode. It features compact design, minimum overall dimensions, small weight, very good accuracy, and fire stability. It is designed for the armament of heavy combat equipment crews and reconnoitering detachments, special anti-terrorist and police troops. In service with the Polish military and police it replaced the earlier PM-63 RAK submachine gun.