Yeah, that's the funny thing about it BB. There are gunsmiths and machinists all over the country (not to mention knowledgeable back yard tinkerers) who could make all kinds of guns if the market was right for it. Most of the designs that are in use today originated about the turn of the 20th century, so it's not rocket science.
                     And the kinds of guns that you're talking about would be even easier.