I'd pump up the specularity and maybe the lighten the diffuse on the barrel where the shell ejector slot is. Just seems a little dull compared to the other metal when it should be the most metal of all since it's not painted.
Really like how this is coming out! although, your concern for the grip would be some what of a nitpick but another texture could help out the look. also the diffuse get take a bit more detailing.
So I apologise for not updating in a while for those that were interested, busy busy. I've textured the majority of the gun (about 90% there), excluding the black grips. I'm not sure how I should best match the concept in terms of the material it's made of - I'd like to get your thoughts. I'm not too sure either about the…