while checking(read fondling) my guns, I noticed my Kel-Tec was having feeding/extracting problems. Not good because it is one of my home defense guns and will be a carry piece once I get my CCW. Looks like the extractor is broken. So, looks like I'm gonna have to send it to the factory for some repair work and having never done that, I have some questions. I know that for repair work I can mail it to them, but do I have to use the post office, or would UPS/Fed-Ex/etc be better? What level of assembly will it need to be in? Anything else I should know about?