DIE is bad. Whisky is good. I don't know where I was going with this. Pizza. Remember the name...
A concept of a gameplay mechanic. Basically the thinking is if your weapon is empty, you can double tap the 2nd weapon key and draw it quickly. No aiming with ironsights or scanning area, just a quick weapon up and shooting untill you are dry or you want to reload.
M4 Model: gamebanana.com/models/2972
Desert Eagle Model: gamebanana.com/models/2989