I looked at an 1891 Marlin yesterday in .32 (.32 Colt?) that can fire rimfire or center fire. Now, from what I read, they were shipped with two firing pins, but the salesman told me that the firing pin that's in the rifle can be used for both.
Nice rifle, too pricey for me ($1150) and I already have am 1889 Marlin .32-20. But the firing pin set up is interesting.