I'm interested in an 870 tactical shotgun setup. I really like the 870P except I wish it were a bit shorter. I want the barrel to be as short as possible. I know with rifles barrels can be as short as 16" before they go to class II. Anyway is 16" legal for shotguns too, if so how come Remington doesn't seem to make one? I know the 14" models are class II and as much as I'd like to have one I'm just not going to go through the trouble or the added cost to get one. Does anyone make an aftermarket 16" barrel? I really like the 870P except I wish it were a bit shorter.