Jonathan Ferguson, a weapons expert and Keeper of Firearms & Artillery at the Royal Armouries, breaks down more of the weaponry of Warhammer 40,000: Boltgun, including the several variants of the iconic Boltgun itself. Jonathan Ferguson, a weapons expert and Keeper of Firearms & Artillery at the Royal Armouries, breaks down more of the weaponry of Warhammer 40,000: Boltgun, including the several variants of the iconic Boltgun itself.