If you are thinking of getting the Dewat M1 that leecass has for sale in the EE, you'll want to find out what parts have been welded up etc... Most likely you will be replacing the barrel, receiver, and parts of, or all of the bolt. Costing those out and the labor to have it all put together right + cost to purchase the dewat will probably be significantly more than just buying one that already works. A project like this would only make financial sense if you already owned the dewat. in my opinion.