I've never seen a ML shotgun barrel for the contender but with all the folks making custom barrels for the T/C's it is probably possible to get one. The cost may be as high or higher than just buying a whole shotgun though. There are several 12ga side hammer guns both single and double barrels in percussion and once in a while I'll see a flinter. There are also a handful of inline ignition ML shotguns on the market. I own a couple ML shotguns and they are a blast to shoot.