I re-assembled the gun and here are some pics. She's now a .56 caliber with a modern steel smooth bore liner. I found some additional markings on the inside of the stock where the barrel fits. I'll have to do some more research. Would like to find out what school or period of time this piece dates to. The Japanese used these matchlocks for some 300 years, all the way up till about 1850. Talk about slow technology evolution
Anyway, hope you enjoy the pics. Rick.