While playing a game enter: R2, L2, UP, Down, Cross, Up, Square,
Enter this code while playing a game: R2, L2, Up, Down, Cross,
R2, L2, R1, L1.
At main menu, enter this code: R2, L2, Up, Down, Square,
Unlock Sawed-off Shotgun
Beat any two missions with a Silent Assassin ranking.
Unlock Silenced Ballers
Earn a Silent Assassin ranking on any mission.
Unlock the M4
Earn a Silent Assasin ranking on the St. Petersburg missions.
Once you complete "Invitation to a Party," you unlock the M4.