OTs-33 Machine Pistol. Part of the Animated FPS Weapons Pack 3.
Its real name is OTs-33 Pernach. It's a Russian machine pistol.
(Updated 16/04/2019)
Changed 'fireloop' value to -1 in gunspec file to fix audio issue of automatic fire mode where the fire sound is cut off as soon as the firing stops.
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Additional information:
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Zoom\Aim down sight - Press Right mouse button
Melee Attack - Press default Left Alt key
Alternate Fire Mode - Press default V key to switch between single and auto fire mode
Note:
This model (including all animations) is also available for download as FBX file, so you can use it in other game engine.
Here you can see a video that shows all weapons, animations and sounds works with Unity: https://www.youtube.com/watch?v=Yg5dVJUcZEs