Straight from the instructions in the software:
Quick scoping is used in Call of Duty games. The idea with a quick scope is to use a sniper rifle, scope in, and fire the shot just as the gun scopes in. Get the timing and the aiming down just perfectly, and you can become a one-man commando with your sniper rifle.
Here's how Quick Scope works:
When in the default button mapping layout, Quick Scope is activated by holding the mod switch and then tapping your melee key. Player 3 LED will blink and then stay lit to let you know that a special mode has been turned on.
To fire a Quick Scope shot, TAP your scope button. The mod will automatically scope in, take the shot, and descope.
The Quick Scope "Delay" (that is, the time from when you press the scope key to the time the shot is taken) can be programmed. Five customizable modes are available. These programmable modes can be used to tune in the quick scope for the various Call of Duty games. The delay smight be slightly different for each game, because each game has a different game engine (different software company).
Here are the factory default speeds for the five modes:
Mode 1: 140
Mode 2: 136
Mode 3: 138
Mode 4: 142
Mode 5: 144
To change to a different Quick Scope mode, hold your mod switch, and then hold your melee button, and then count the blinks on the LED.