Okay so this is my first black powder cartridge firearm and I have always wanted a rolling block. I found this rifle today at a yard sale and payed $200 for it, the hammer tension is very strong and the bore looks pretty good. But I do have a couple problems I think. I can't find any where on the internet another RB with this type of finish, does anybody here know if this is right for this gun? Another question, the guy said it fired 43 Spanish but after a little research I found that some were converted to other chamberings, is there any other way to tell what caliber this is or will I have to buy some cerrosafe? Here are some pictures, any help would be appreciated thanks.