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PM-84P submachine gun, with shoulder stock retracted and forward grip unfolded
| PM-84 | PM-84P | |
| Caliber | 9x18 PM | 9x19 Luger / Parabellum |
| Weight | 1.84 kg empty | 2.17 kg empty |
| Length (stock closed/open) | 354 / 560 mm | 375 / 575 mm |
| Barrel length | 165 mm | 185 mm |
| Rate of fire | 600 rounds per minute | 640 rounds per minute |
| Magazine capacity | 15 or 25 rounds | 15 or 25 rounds |
PM-84 Glauberyt submachine gun has been developed in Poland during early 1980s, as a possible replacement for overly expensive PM-63 submachine gun of roughly same size and properties. However, PM-84 has been designed for less expensive manufacturing (using steel stampings instead of machining), and also in two calibers instead of one; the 9x18 version was destined for Polish use, while 9x19 version was obviously intended for export. With the fall of the Iron Curtain and dissolution of the Warsaw pact, Polish military and police switched over to 9x19 Luger caliber. To-day, onlye the 9mm Luger version is manufactured in Poland by ZM Lucznik factory, as PM-84P Glauberyt.
PM-84 is a blowback operated weapon that fires from closed bolt and has a separate hammer unit. The rectangular receiver is made of steel stampings, with the bolt reciprocating inside. Cocking handles are made in the form of two "ears" projecting from slots at either side of the receiver. It has a safety / fire selector switch located above the grip, on the left side. Double-stack magazines are inserted into the pistol grip, and have capacity of 15 or 25 rounds. Magazine release is located at the base of the pistol grip, just behind the magazine well opening. The Glauberyt submachine gun also features a bolt hold-open device, with bolt release lever located on the left side, in front of the manual safety / fire selector lever. Both front and rear sights were protected by wings; rear sight is of flip-up type with two range settings, for 75 and 150 meters. PM-84 submachine gun is fitted with folding front grip under front part of the receiver, and with retractable steel buttstock.
