About 27 years ago I saw, in some museum, a Ferguson rifle. I am pretty sure it was the West Point museum.
It was some kind of officer's version, or private sporter. It had a sliding bayonet. The placard explained that the bayonet was not for combat, it was for hunting european boar. If the first shot provoked a charge, you could stick the pig with the bayonet.
Sorry, that's all the info I remember. Can't recall the stock. Seem to remember the rifle was on the shortish side.