User blog comment:JoeRamirez/Call of Duty Modern Warfare 3 Weapons Wishlist./@comment-86.153.62.8-20110104234026/@comment-85.96.176.126-20110219104124

Shotguns are primary. Most of the secondary shotguns are used to open doors, but they're being phased out by the MasterKey, which is used to open doors.