Any muzzleloading barrel blank will work. There were 2 different breechplug threads depending on the caliber and breechplugs show up on eBay fairly regular There's a 3/4-16 one there right now, $12.95 + free shipping but anyone with a lathe could make one from a bolt in just a few minutes. The end that goes into the action is 5/8" dia..
After fitting the plug you only have to locate, drill & tap for the nipple, add sights & thimbles. That's the real beauty of these things.
(also a new hammer & pin for $25 & free shipping)
After fitting the plug you only have to locate, drill & tap for the nipple, add sights & thimbles. That's the real beauty of these things.
(also a new hammer & pin for $25 & free shipping)