That's bad ass man. You should throw a little bit of color in the spec for the metal, I've always found that can help it pop a little better. That's a sweet design though man.
Nice work so far. I agree with the comments above. Right now the gun looks pretty dull as far as textures go. I think the metal parts of the gun arent metallic looking enough. As far as I can see that would just be your spec. The rework on your diffuse looks better. Try and increase the spec level on the metal parts and…
Wow! :D Each time you post, your improvement is exponential!! I think that spec map is looking great and is giving your gun the awesome metallic feel you're going for. Good job!
Thanks everyone for the crits I have messed around a little more with the spec map added in some subtle color variation and highlights let me know what you think. I have been staring at it too long to be objective at this point. Thank you all for the help!