I got a question, I was thinking of chopping my barrel down. I have a remington express 870, and would like to have a breacher tip. I have found the choke styles, but if I chop it then I will have to get it rethreaded. Now I have found the 18" barrels for 100 bucks, and was wandering do those come threaded? If not, then who does anyone recommend to have it threaded? My local gunsmith won't do it.