How a PM-63 RAK works

The RAK is a selective-fire straight blowback–operated machine pistol, fired 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. The slide is part of the fire rate-reducing device.

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 rim 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.

https://en.wikipedia.org/wiki/FB_PM-63

PM-63 RAK: full disassembly & assembly
https://youtu.be/Vem5eFDQQrQ

Don't try to recreate what you see in this video, as this is gameplay. This video was created using the game World of Guns:
http://store.steampowered.com/app/262410/
This game is also available on Google Play, App Store, Amazon and other platforms.

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