The 16ga barrels are twist which is technically damascus. I belive the 10ga are also but I've never seen twist with that pattern. Pieper is known for doing strange treatments on barrels. The thicker areas on the 10ga are an example, but I've seen steel chamber damascus barrel and steel muzzle on 1 gun. Areas were seperated with a gold band. I like the 16 better than the 10.