Cheats, Codes & FAQs
Silenced ballers gun
Finish a level with a "Silent Assassin" rank.
Finish a level with a "Silent Assassin" rank twice.
Finish five levels with a "Silent Assassin" rank to get the M4. Alternately, complete the Shogun Showdown level with a "Silent Assassin" rank.
Silent Assassin ranks
You can still get a Silent Assassin rank on a mission if you are spotted. To get a "Silent Assassin" rank, there has to be nothing in the aggression bar. You can make sure of this by only using chloroform on guards and eliminating the target with just one shot.
Getting the M4 (M16)
In the motorcade level, you need to clear the town quickly and grab the supplied rifle. Shoot your target. This will cause the UN guards to stop and run on foot to your position. Wait until they get through the gates, then dodge their shots and put them in the cross fire from the remaining troops outside. Since you cannot hurt them, do not shoot. They will soon shoot their own men. Then, just run up and grab an M4. This may not be easy, but it does work. To get the M4 easier, just use the fiber wire on the UN guards.
Getting the 22SD pistol
The .22SD is well hidden in the castle level where you have to kill Hayamoto senior. It is one of the items that is displayed in his museum.