Yes, it is a 12. Actually, I would like to trade the cantilevered, rifled slug barred for a rifle sighted one and am thinking about putting an ad in the classifieds of GBO. Since the gun was "as is" it only came with the one barrel and I will also have to buy a bird barrel with the chokes. The 22 or 24 slug barrel is great for rabbits as the cyl. bore opens up so meat isn't destroyed. Distances are close so a slug barrel with 6's or 7's in a 2 3/4 works great. The shorter length brings the shotgun to shoulder faster as well.