Metal Gear Solid 2: Sons of Liberty HD Edition Cheats

Very Easy Mode - Obtaining AKS-74U Suppressor [AK.SUPR]
You will find this item in the Strut F Warehouse Card Level 2 room where you pick up the AKS-74U on Very Easy.

To obtain the AKS-74U suppressor on other modes, flip/cartwheel (using X) off of the "ramp" on the Shell 1-2 Connecting Bridge (located just to the left of the metal beam), following the Harrier boss fight. You will need to hit X right as you run to the edge to land safely. Among two other items is the AK.SUPR. It lies behind the small fire. You will be contacted on the cellphone telling you how to put it out (use the coolant spray). Equip the suppressor and the weapon at the same time to suppress the gun.