It was alway the most fascinating gun to me, but on the practical question, 1) how do you get a two piece barrel to be accurate and not come unscrewed during shooting 2) how do you sight the pistol with no front sight 3) how many NFA stamps do you need for a two piece silencer and shoulder stock pistol ( and two of the guns were full auto, too) There are fellas making up operational guns, both pistols and carbines, but mostly they will only be blank firing. I made up a live firing pistol, but to maintain the profile, it never had a front sight, and was across the room accurate only. It did look cool, though, but most any newer DA9mm had a better trigger pull, and functioned better.