Pietta PAF5111/44BR Cylinder .44 Cal 1851 Navy Black Steel Revolver
https://www.tandktactical.com/shop/641996730498-pietta-paf5111-44br-cylinder-44-cal-1851-navy-black-steel-revolver-35728
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Pietta spare cylinder #15-16 for the 1851 Navy in 44 Cal. is non-engraved. Includes nipples.
