I have a problem. I'm modding a weaponskin, and whenever i turn to the left, It shows my gostek as holding it by the barrel and shooting out the handle.

The weapons-gfx folder has files for each gun, for example: "steyraug" and "steyraug-2." The "-2" should be the same as the file for the original except it should be flipped vertically. That should fix your problem.