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Earn a Silent Assasin ranking on all of the St. Petersburg missions up to and including ''Invitation to a Party'' without any aggression. Pass ''Invitation to a Party'' last and you will recieve the M4.
Get An M4
You will receive the ''Sawed Off Shotgun'' after gaining 'Silent Assassin' ranking for the second time in the game. This must be on a mission which you haven't received the ranking before.
Get a Sawed-Off Shotgun
You will receive ''Silenced Ballers'' after gaining 'Silent Assassin' ranking for the first time in the game.
Getting Silenced Ballers