I haven't handled all the availabe varieties of replica & originals...but note they all don't have the same "parts"....some incorporate a camming, mechanical FP retractor (as the breech is lowered) and may use a spring-loaded, 2-piece firing pin with it...which negates positive retraction of the FP (ala Pedersoli "sharps"). The result, if not retracted is either dragging the FP thru the cartridge brass, or particularly in the one-piece designs, breaking the FP.
Slim