First Gun, Assault Rifle

So I am new to pixel art, I am more of a "3D artist" guy, but I have done some heads and hats in the past. This is my first go at making a gun (or really anything other than a head or hat), and it took me about two-three hours. I wasn't happy with the shading many times so I kept redoing it. Overall I am happy with the final result because it was only my first time, although it is far from perfect :( . Any feedback would be nice. (Click the images to enlarge)
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wow.. this is really amazing :)

Thanks man :D

nice its a really good gun :)

I really love this.

It's very good for your first gun! ;)

Very nice job Frodew! :)

I appreciate the positive feedback :) , but does anyone have any tips or suggestions?

Looks great, front grip looks a bit pointy

Awesome! Could u tell me how to make these!