My dad recently gave me his service Glock 17 after he retired from the police dept. (His retirement gift was a third gen Glock 23). I love everything about the gun, however it needs a little sprucing up( its a Gen one or two) having been in service since the late eighties. My question is, is there any way to restore it to its original color? Duracoat, Cerakote? Blueing? I don't know where to start.