Can be 357 or 38 spl. I prefer the centennial style internal hammer. It must be in good condition with little to no visible wear and absolutely no damage such as flame cutting on the forcing cone. Gun must NOT have a internal lock like all the smith and taurus snubbies I see at the gun shops have. I personally just detest the little keys and distrust their reliability. I won't overpay but will agree to a fair price.