 While the Colt employs separate screws for the cylinder stop and trigger, those components share the same through-frame screw in the Remington design.A downside in the design of the 1858 is that the barrel and receiver are a single piece, making it more difficult to clean the barrel, as it cannot be removed.Another innovative feature (first appearing in the 1863 Model production series) was "safety slots" milled between chambers on the cylinder.