The highpoly should have more details to it if it's going to be the highpoly. That tape and hand grip you have on it, make that part of the actual model, just a little tiny raised bit of polygon's.
And a normal map would help as well. You can create one from your texture using xNormal in photoshop (assuming you have photoshop).
Last critic, the texture looks... bland. It needs some more visible, well texture to it. I can't see any metal, just a grey blob, and i don't see any grains to the wood.
Great start though mate! Few tweaks and you'll be good to go.