I have found a site that sells a booklet with construction details how to make a a semi auto Sten gun from commercial parts sets. included in this kit is BATF guidelines and FBI card for registration. It sounds legite, does anyone else here know of anything out there that is similar to what I have described? If so what would the construction costs be? Is there alot of machining involved(converting bolt/new parts made)? Catco sells their semi auto kit for 270$ and then you buy the parts/reciever housing and assemble. Would this be the better way to go? I don't want to invest in this if I am going to have to spend a lot of moulah to assemble it by machining a bunch of new parts. Ill send the URl to anyone who is interested in checking it out.