I have reworked a few locks. They usually need a lot of work. The pistol lock I did was almost beyond working. I ended up buying a Chambers gunmakers lock, and making my own as close to the one supplied as I could. The inside looked like it was done with a horse shoe file. Very rough, and parts were soft.
Mystery Metal. Yes, you can rework these guns, but you still end up with the same barrel and breach.
The breaching was what convinced me to decline further work on these India imports. I don't need the liability. All those who complain about improper breaching in American black powder barrels, and the need to check for proper seating etc, really need to examine these [imports] and then decide for yourself if you want to fire one . Just my 1 cent.