The 1851 Pepperbox is built on an 1851 Navy revolver frame with a longer cylinder retained on the cylinder pin by a threaded screw. It features a case hardened steel frame brass backstrap and trigger guard and a walnut Navy size grip. Although it does have a longer cylinder the Pepperbox does follow typical loading recommendations for a Navy revolver that are included in the manufacturer's manual. No conversion cylinder is available for this model.