Hi,

I'm doing a Counter Strike Mod, I want to make my weapons like in Call of duty MW series. I want to set Shield as primary weapon, that means, you can't use pistol and shield at the same time.
http://www.youtube.com/watch?v=DNFbRybp2J0
Like this

. When you select primary weapon slot, deploy the shield and holster the secondary weapon, and vice versa