Yes, Tinker,
that is a db with a sling on it, which anywhere bar Europe might suggest it's a rifle.
I once read an early 20th-Century book on hunting by a man called Wynn, I think. He had two favourite rifles for boar: one was a 4-bore double and the other was a 6.5 MS, which shows he had great faith in the smokeless revolution.

Thinking of double shotguns with slings, my neighbour (a Slovenian) said they had a special use for them in Tito's Jugoslavia. It seems people were not allowed to hunt on their own - in case they were not hunting but up to some personal no good. But when a man really felt the call of the wild, he would take his shotgun to bits and put the sling around his neck with barrels hanging down one side of his chest and buttstock/action down the other. With a big coat over that he could walk out of town in the winter with impunity.

But if he ever got a boar as big as this one, he might have had trouble getting a picture of himself with it - or bringing home the bacon.