Fishhawk-
I've got a Winchester Model 1200 Riot Gun, which is a fun toy to bring along on a cruise or fishing trip, as well as a great self-defense weapon.
I don't store it on board, even though I'm almost always in fresh water, for concern over the rust/corrosion issue.
Some hunters feel the action isn't as good as the old, hard to manufacture Model 12, but I've never noticed any limitations on it's operation.
It's a cannon loaded with slugs or buckshot (even though it's not a magnum), and we've done some fun modified very short range skeet shooting on my C-Dory 22 and Sea Ray 265 Sedan Bridge with it.
Best if you don't shoot from under the canvas, though, as 'dem holes could get expensive!
(About 30 years ago we were conducting a sailboat championship on San Francisco Bay, and one of the stiff shirt/blue blazer type race committee members got overly excited during a general recall where you have to fire two additional blasts and blew the center out of the race committee flag flying from off the backstay of the big sailboat! 12 gauge blanks with just black powder and wads still do some damage at less than 10 feet! Kinda embarassing as little pieces of blue cloth fell down all over the place. Blows a hole in not only your flag, but your holier than thou image as well!) "Score one" for the Commodore, or whoever!
All joking aside, a 12 gauge shotgun is a serious weapon when you need it! You DO need to think though what circumstances would make you use this device as a weapon in advance, however. I doubt I'll ever have to do so here, though, so it's more of a recreational sport item.
Joe. :teeth :thup