I'm fairly new to customizing guns, and I was curious if there are options out there to convert a choked Winchester Model 12 (12ga) into a home-defense weapon from its current hunting shotgun status. Right now it's got a long choked barrel and a big hefty butt that I would like to be able to swap out at will with a pistol-grip or tactical stock and a short unchoked barrel. The catch is I want the barrel/mag assembly that easily breaks away from the "receiver". I've hunted for the replacement barrel/mag assembly and it's not exactly easy finding a replacement let alone an unchoked short-barrel. Again, the basic idea is if I want to go hunting I put on my long choked barrel/mag (with the plug in it to limit it to 3 shots) and regular butt stock... and then for home defense I slap on the short barrel/mag and tac stock with a fully loadable mag. Notes on legal implications and difficulty of finding such a setup are appreciated.