Jonathan Ferguson, a weapons expert and Keeper of Firearms & Artillery at the Royal Armouries, breaks down the weaponry of Isonzo, including the Madsen machine gun, the Rast & Gasser M1898 revolver, and iconic Italian firearm, the Villar Perosa. Jonathan Ferguson, a weapons expert and Keeper of Firearms & Artillery at the Royal Armouries, breaks down the weaponry of Isonzo, including the Madsen machine gun, the Rast & Gasser M1898 revolver, and iconic Italian firearm, the Villar Perosa.