What kinda weapon is that?

Looks like a futuresque Tommy Gun.

I can see where you'd think that, but, personally it looks like a Soviet PPSH (Pepeshay) 7.62mm submachine gun from WW2

I guess it depends on the artist's answer

That's not a bad guess actually, the barrel head of the ppsh is significantly thicker and more accurate to this gun than the thin barrel of the thompson albeit the ppsh's distinct recoil compensators along the sides are missing. But I'll be frank, I'm not well versed with the varieties of guns so it was actually based on the thompson x3 Thanks for letting me know about the ppsh though ~

Not well versed? I beg to differ by your strong knowledge you spat out for the PPSH. Then again, even if all you did was quick research, I have to commemorate you on your "foot-forward" response to my comment. Nice to see someone with a little initiative ^,...^

On the flip side to this. If you ever need a little help with troubleshooting weapon knowledge, need some advice on picking something out, or just ever wanna know more about them. I've studied the entire history of them since I was a kid and am fluent in not only ones you would hear of in museums, but also ones that less than 1% of gun collectors themselves have even heard of.

I'm obsessed with fringe science history, and that goes especially for man kind's most R&d'd device, the good ole fashion boom stick ^,...~

Now this guy has a style. :p