What to do for silen?
first start .exe then your game (optimal: place a tape on your screen with a dot for a unbanable crosshair) go ingame and look which mode is enabled.(normaly its silentshot) and just press mouse5 it should like. quickscope then your weapon moves up and switches to your sniper again.
Make sure you set rightclick to hold aim in keyboard options otherwise it will not work!
good luck