Well here it is, have no idea why I chose this shotgun out of all of the ones in the graveyard that is cs:cz skin section. Also, if you want to add a glove texture, the size for it is 512x510 for some reason...
The color looks plain. Some of the textures use a criss-cross layer, I guess you should try to remove it? The noise-motion-blur-metallic-effect is sometimes good but when used on many parts repetitively is kinda' bad.
The lighting is good but some other parts of the gun needs lighting, the holes (for example) should have a dark edge to make the hole more visible in-game. Since this is GoldSrc, it really needs a painted lighting.
From my opinion, I like everything except the criss-cross layer and the noise-motion-blur-metallic-effect. Good job man!