Call of Duty Modern Warfare Remaster Walkthough Part 11 - One Shot, One Kill. Call of Duty Full Playlist: • Call of Duty Modern Warfare Remaster Walkt... Lieutenant Price and Cpt. MacMillan waited patiently on the top floor of the hotel with a Barrett .50cal sniper rifle for 3 days, waiting for their assassination target, Imran Zakhaev. Call of Duty 4: Modern Warfare is a first-person shooter video game .developed by Infinity Ward and published by Activision. It is the fourth main installment in the Call of Duty series. The game's story takes place in the year of 2011 when a radical leader has executed the president of an unnamed country in the Middle East, and an ultranationalist movement ignites a civil war in Russia. The conflicts are seen from the perspectives of a U.S. Marine Force Recon sergeant and a British SAS commando and are set in various locales, such as the United Kingdom, the Middle East, Azerbaijan, Russia, and Ukraine. The multiplayer portion of the game features numerous game modes and contains a leveling system that allows the player to unlock additional weapons, weapon attachments, and camouflage schemes as they advance.