What, you don't use the -mod parameter? I've got like 20 testing folders.
(one to test alpha transparency with the .png to .bmp trick, one for each of the gosteks I'm trying to make, one for single weapons I made, etc.)
Anyway, I don't really like this. The stock looks funny (it goes down too far) and IMHO would look better not as a single pixel of absolute black. The clip needs to curve more, it looks like it's straight. The colors are good, though.
So, nice effort, but I think it could be a lot better.