I'm making my own modpack for a game with a friend based on creat. I'm using some weapons from the mod. In short, at first I liked the iron javelin (it looks cool like an sks), but it's not an auto-loading rifle. So I took the Mas 55, but I don't like its extended drum mag. I would like to change the texture to javelin extended mag, or something similar?

This is not necessary. I love this mod and will continue to play it as is.