I picked up a Westernfield 550 (Mossburg 500) 12 ga. at a pawn shop with the intent of making a 'Katrina memorial Ray Nagin kiss my wet Cajun arse' home defence gun. My idea is to remove the adjustable choke, shorten the tube and re-mount the choke for a legal length of 18.5 in. the guestion is, how is the c-lect choke attached to a plain barrel? How to remove without screwing both up? HELP!! thanks in advance, John