Gander Mountain up here in Fargo handles them. They have a pretty good selection most of the time. I have purchased a couple there. The rifles will accept most rifle barrels and all shotgun barrels except 12 Ga. The shotgun recievers will only accept muzzle loader and other shotgun barrels. Buy a rifle and I think the shotgun barrels are about 55-60 dollars. You do have to send the reciever in to have the barrels fit as they won't sell just the barrels. Good Luck.