The few I've seen had some issues re the frizzen being less than hard and the cock /flint struck rather low on the frizzen surface . If you look at the frizzen and spring arrangement, the geometry looks "off" . Actually, I'm not impressed with the internals of the ones I've seen.
I fooled around with a couple of these locks for friends and got them to work better than they had been by polishing and hardening/tempering some of the wear points, but in the end, both friends elected to replace the locks with the L&R RPL locks. It didn't take much work to fit them, and the 2 guns work a lot better .