Well here's what I want to do. Extend my Hatsan MPA-TS and choke it. The current barrel is threaded (as most of you know) and I'd like to take advantage of that. If the barrel piece I get is thick enough, I'll just tap it and screw it on. If it's not, I have a friend who can make me an adapter piece. I'd then solder the adapter to the barrel and tap it accordingly. If this works the way I want (and I can get it to all line up ), it should be pretty sweet shooting. I have found what I want on the interwebs for Saiga 12's and Benelli M4.s, but they were custom made. A Polychoke for a Saiga would screw right on and accomplish the same thing, but I like to make stuff. Besides, I've never been known to do things the easy way. One other thing. If this works, I can return my shotgun to the way it came in the box.