I have a friend with a KS-5 he is thinking of selling. Don't remember what the difference was, if any between a KS-5 and a special but it has all the adjustments, stock, rib, butt, etc., plus release trigger parts and the original case. Believe it is a IM choke. He hasn't shot trap in quite a while do to some eye issues but it is in pretty good shape. Not sure what specifically you are looking for but I know this gun is a shooter...won him a bunch of stuff. If you are interested contact me and if it might be what you want I will give you his information.