Nicely done. I love how much detail you are putting into this. It may not be exactly like the real thing, but it looks pretty close if you ask me. It needs to be a bit longer, but either than that, I like it. You should make this into a pack. I expect some good stuff from you now.
Yep, I will totally make a weapons pack, probably based on Valve universe.
And then, after that, default-styled weapons pack maybe?
NINJAEDIT: UPDATED! New features are everything: new particles/emitters, right click toggles between two modes, bullet spread decreased when crouching and stuff.
Also updated model and screenshots.