The Necromunda rules describe a Bounty Hunter as having a vast number of weapons, more than I could ever model on him, and I'm not keen to cover him guns either. This does mean that I can have him holding pretty much anything I like. This Bounty Hunter's head is slightly elevated, so he'd suit a weapon raised to the sky.
I've attached a Forgeworld resin chainsword to an Empire militia arm, and the other arm is from a modern Imperial Guard vehicle crewman, with a resin boltpistol also from Forgeworld. It pains me to cause permanent damage to such a venerable mini, but there's only one way to turn him into a robust gaming piece, so I drilled the shoulders and pinned the arms on.
Using the rules for a Ratskin Scout, the Dogskin can be armed with one of several basic (two-handed rifle-type) weapons, and a maul, bludgeon or axe. As he's largely bare-chested, unclothed arms would fit best, and a good source of these is the Empire Flagellant kit.