I dont know about Pieta's but Army San Marco 1860 replica internal parts don't fit originals at all
Army San Marco were pretty out there, I tried to work on a nickel plated one, no luck.
OP if all you needed was something to start from I think they would be better than nothing. There used to be parts kits for them with springs and some internals that would be a cheaper unregistered option to try first.
I dont know about Pieta's but Army San Marco 1860 replica internal parts don't fit originals at all



























