That is a Snider patent action. I collect them.
That is a bad belgian copy... probably no safe to shoot. I have one. Terribly crude. Made for trade in the Congo. If the Zulu's had them.. they got them from a long way off. Belgian made guns were generally further north in their 'turf.'
I also have Snider Patent guns by Enfield (They used the patent action to convert Enfield caplocks to breechloaders before the advent of the small-bore Martini). And a number of companies also made commerical rifles on the patent action. The nicest ones I have are Rook Rifles by Greener and Rigby and they are rather stunning. That and a Mahout rifle by, I think, H&H.
But the African guns are best used as lamps or, in my case, because it is an example of a really 'bad' Snider action... that contrasts with my good one.
Cheers,
Sirhr