Jonathan Ferguson, a weapons expert and Keeper of Firearms & Artillery at the Royal Armouries, breaks down the weaponry of the Call Of Duty: Modern Warfare 3, including the Remington ACR, the Accuracy International AS50, and the H&K XM25. Jonathan Ferguson, a weapons expert and Keeper of Firearms & Artillery at the Royal Armouries, breaks down the weaponry of the Call Of Duty: Modern Warfare 3, including the Remington ACR, the Accuracy International AS50, and the H&K XM25.