It's been a while, I haven't been doing as much 3D modelling as I'd like.
I've removed Automatic Flatten UVs, it wasn't the problem.
I'd like to draw attention the the stock, however. You can see the high poly through the low poly. I've play with the low poly model so that you can't see the high poly through it.
This is the result of moving the polygons. While I've no idea what the big red square on the stock is, I thibk I've fixed it as a whole. Any comments? Should I continue or try to fix more?