| PM-63 RAK | |
|---|---|
| Type | Submachine gun |
| Place of origin |  Poland |
| Service history | |
| In service | 1965–present |
| Used by | China, Cuba, East Germany, Poland, Vietnam |
| Production history | |
| Designer | Piotr Wilniewczyc |
| Designed | 1950s |
| Manufacturer | Łucznik Arms Factory |
| Produced | 1964–1974 |
| Number built | Approx. 70,000 |
| Variants | PM-70, PM-73, Type 82 |
| Specifications | |
| Weight | 1.6 kg (3.53 lb) |
| Length | 583 mm (23.0 in) stock extended / 333 mm (13.1 in) stock collapsed |
| Barrel length | 152 mm (6.0 in) |
| Height | 145 mm (5.7 in) (short magazine) 213 mm (8.4 in) (long magazine) |
| | |
| Cartridge | 9x18mm Makarov (PM-63) 9x19mm Parabellum (PM-70) .380 ACP (9x17mm Short) (PM-73) |
| Action | Straight blowback |
| Rate of fire | 650 rounds/min |
| Muzzle velocity | 320 m/s (1,050 ft/s) |
| Effective range | 75 and 150 m sight adjustment (9x19mm Parabellum) |
| Feed system | 15 or 25-round box magazine |
| Sights | Flip rear sight, front blade 153 mm (6.0 in) sight radius |
Operating mechanism
The RAK is a selective-fire straight blowback-operated weapon that fires from the open bolt position. Unlike most submachine guns firing from an open bolt, the PM-63 has a reciprocating external breech bolt, also known as a slide.
When the trigger is pulled the slide is released and driven forward by the return spring, stripping a round from the magazine and feeding it into the chamber. As soon as the cartridge is lined up with the chamber the extractor grips the cannelure and the gun fires while the slide is still moving forward. The firing impulse retards the forward movement of the slide and drives it back. The extractor grips the empty case until the ejector pushes it through the ejection port in the right of the slide. The slide continues to the rear and the return spring, located under the barrel, is fully compressed. The slide rides over a retarder lever which snaps up and holds the slide to the rear. The rate-reducing device, an inertia buffer in the rear of the slide, continues rearward under its own momentum and compresses the buffer spring. When the spring is fully compressed it throws the retarder forward and this pushes the retarder lever down out of engagement with the slide and, provided the trigger is still depressed and ammunition remains in the magazine, the slide goes forward to repeat the firing cycle.
Features
The submachine gun consists of the following main components: the barrel, frame (containing the shoulder stock, pistol grip and forward grip), slide, return spring and spring guide rod and the magazine. The slide houses an inertia buffer and spring retarder mechanism, designed to reduce the weapon's rate of fire down to 650 rounds/min from a natural frequency of about 840 rounds/min. The slide telescopes around the barrel up to the muzzle and has an extension that serves as a recoil compensator which deflects muzzle gases upward to counteract the natural rise of the weapon when firing in automatic mode. The compensator is shaped like a long spoon and can be used to cock the weapon with just one hand, accomplished by pressing the compensator up against a rigid vertical surface until the slide locks back.
A spring-loaded extractor is installed inside of the slide and a raised side wall of the seated magazine acts as the casing ejector. The striker firing mechanism has a firing pin fixed within the slide. The firing control mechanism does not have a fire selector but is instead equipped with a two-stage progressive trigger that enables semi-automatic fire (after pulling the trigger back to the first stop and releasing it rapidly) and continuous fire (pulling the trigger back completely to the rear and holding it back). The manual safety secures the firearm against accidental discharge by immobilizing the slide in its forward, rear and intermediate positions that the slide assumes when the weapon is being stripped or assembled. The safety toggle is located on the left side of the weapon's frame, behind the pistol grip.
The retractable metal stock (made from strips of flat bar) is ended with a pivoting shoulder pad. The stock is pulled out and used with the folding vertical grip to provide a steady hold during automatic fire. The weapon’s barrel, which can be removed by the operator in field conditions has a chrome-lined bore and 4 right-hand grooves with a 1 in 252 mm (1:10 in) rifling twist rate.
Sights
The flip rear sight (open type) provides two notches with range settings for firing at 75 and 150 m. It and the front blade are fixed to the slide's top surface, making aiming the weapon and correcting the follow-up shot, particularly in rapid fire mode, very difficult.
Feeding
The firearm feeds from two types of double-column box magazines: a short 15-round and long, 25-round magazine (the magazines are seated inside the hollow pistol grip). The magazine catch/release is at the heel of the pistol grip. After the last cartridge has been fired from the magazine the slide is locked open on the slide catch. The pistol grip covers and folding vertical forward grip are made from a synthetic plastic material. The PM-63 uses the 9x18mm Makarov pistol cartridge.
Accessories
The weapon can be deployed like a regular pistol, one-handed. Additional equipment supplied with the submachine gun includes three spare long magazines and one short magazine, a holster, sling, magazine pouch and a cleaning rod and lubricant bottle.
Variants
In 1971 a version of the PM-63 was developed in Radom for the 9x19mm Parabellum round, designated PM-70. Only several units of this version were built in a prototype pre-production batch and further production was abandoned due to lack of demand. A variant adapted for the .380 ACP (9x17mm Short) cartridge (known as the PM-73) and a silenced version were also built, but failed to gain orders.
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