Called the Windsor FSU-4, this rifle is a customized AR15. It has a short barrel, round handguards, and a long flash hider like the XM177, and a fixed stock like an MI6. The plastic furniture is green like a Diemaco C7. The underbarrel grenade launcher may be either an M203 or a Cobray. It is used in two levels: "Night of the Jackal" and "Fire and Water". Carla uses the FSU-4 in Night Of The Jackal. The FSU-4 has an erroneous 40-round magazine, whereas real life MI6 weapons use either 20 or 30 round magazines.