Yes, I've also got one of the modern reproductions (chambered in the appropriate .45-75 cartridge) but of course can't use it in regular CAS stages ... Don't think anyone has ever made a reproduction or lookalike chambered in a pistol caliber, which is why I had the "faux" one pictured above made for me in .45 Colt ...
Here I am holding my .45-75 Model 1876 reproduction at Fort Macleod in 2012 (in my CAS persona of "Rattlesnake Jack, Scout, Rockly Mountain Rangers") when PJ Hardtack (who just posted above) and I presented a display and demonstration of period firearms -
Same trip, inside the museum by their display of an original NWMP '76 Winchester -
And here are PJ, in his persona of an 1860's (I believe) Royal Engineers Sergeant-Major, and I with a couple of the interpreters at Fort Macleod -