I have a very nice 1100 duck gun that my dad gave me, I don't bird hunt, so I'm wanting to put a short (18") barrel on it, so I can use it for HD. I know the gas ports in the police 11-87/1100s are bigger, to make them cycle, so I don't want to buy a long barrel and chop it off. Any ideas on where to get one? Even a 20" is fine. I'd like a blued one, so it matches.