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Get M4 Without Silent Assassin Ranking on St. Pete
Play Motorcade Interception. Get atop the tower that is along the main stretch to the palace. Snipe the guy in the limo. After he dies, the UN troops will get off the jeep and come to shoot at you. The jeep will lay down supressive fire. If you can get one of the UN troops between you and the jeep, it should kill him without failing the mission. Pick up the M4 and head to the extraction point. You now have the M4 in your shed--a whole hell of a lot easier than beating the St. Petersburg missions on silent assassin.
From Austin Friend