That does explain the MH carbine, as the Natal Carbineers were never issued them. Unless after the Zulu War 1879 ? This is a very interesting photo showing how well the horses must have been trained to the noise of gunfire to be used in such a way, hopefully without moving. I wonder if this method was also used by the likes of the I.M.I., N.C., N.M.P., B.B.G. as well as the men in the Buller's Colonial Irregular units ? I've seen something similar in U.S. Cavalry training.