I am about to go pick up my new Mossberg shotgun. I got the 535 3 barrel combo, which is great it will get me through deer season this year. It comes with a 22" turkey barrel, a rifled slug barrel and a field barrel and 3 chokes for the turkey barrel. I want to pick up a scope for the slug barrel.. It has a scope mount already, so can I get any scope I want? or does it have to be a shotgun specific scope?