Got this info in an email today. For anyone who bought one of their .22 pistols and would like the option for 30 bucks. They also carry engraved and plain .22 cylinders.
https://www.shopheritagemfg.com/parts-1/heritage-22wmr-cylinder-black-6-shot-331-0002-01
https://www.shopheritagemfg.com/parts-1/heritage-22wmr-cylinder-black-6-shot-331-0002-01