Back in the 1970's , bought an Italian copy of Harper's ferry musket in .58 cal. . See my previous post , this thread , section #1. I eventually replaced the lock with a copy replacement of the original made by L & R. That fixed the lock problems , but the rifle , due to the caliber and using minie balls ,the quirks of trying to hunt deer in the Pa. m/l season with that ammo, made shooting at unknown distances chancy. I had just built myself a new flat shooting .50 cal. longrifle , which solved the rainbow effect seen with the .58 Harper's Ferry......oldwood