To re chamber to .380 you need to do work on the bolt face and extractor. They can be touchy reliability wise. Some run like a champion, some never run right. A 30 reid conversion is the simplest and most reliable, but it’s a reload proposition only, although Epp’s has dies for it. If it’s already a.380 you just do the barrel. Be prepared to wait a few months till paperwork catches up to you. And you can’t take possession till then