I have a Winchester SX-3 with a 28" barrel and a 3.5" chamber. I want to be able to use it for 3 gun matches as well as hunting, so I don't want to cut the barrel down. I was looking at extra barrels from winchester and they make a 24" turkey barrel with sights. How would that work? I was also looking at FN barrels. Do they make a barrel that will fit? Are there any barrel length restrictions in 3 gun? What should I do? Thanks for the help.