I am not sure about the bbl availability, but you will never be undergunned with a 3" (or in my opinion 2 3/4") 12 g. gun. I have never shot 3" slugs because a standard 23/4 is so dang devastating, and the extra shell size doesnt really compensate in the rapidly declining accuracy of all past about 75 yards (in an 870 type weapon). A fine slug gun regardless, though.