I was thinking about M203s for some reason and then remembered seeing a war movie with a 12ga attached to either a AR-15 or a M16. I cant remember which exactly. Is it possible to attach a 12ga to the bottom of a AR15? I know the have short barrel 12s out but is there a kit that someone sells? Also does anyone know if theres any legal problems one would encounter? I'm guessing this would be the ultimate HD weapon.