Nice work! And very well baked edges! You might be able to break up the materials a bit more, perhaps make the slide a bit lighter, the sights a different shade of metal etc. The materials are all well defined, but the colors are all similar shades. Is this a screenshot from hlmv? If you are going to mess with the materials you should do it in engine, because source renders stuff differently to a 3d viewport. But that's really all I can pick out man, this is top quality work!