I gave this model an attempt at skinning, as you can see the skin bites ass, a skinner I was talking to told me that when it comes to gun models, photo always looks like crap,, so maybe I'll try doing a skin by hand
Maybe you could shade it a bit more, like under that metal part there will always be some shadows so you could use the burn tool to make some shadows there. The "render to texture" option in Max is a good guideline to know where those dark/lights areas are.