Pietta PAF6012 Cylinder .44 Cal 6 Rounds 1851 Navy 1860 Navy Black Engraved Steel Revolver PAF6012. 44 Cal 1851 Navy 1860 Navy Black Engraved Steel Revolv - Pietta engraved spare cylinder for the 1851 Navy & 1860 Navy in 44 Cal. Includes nipples....