Hidden weapons on a vehicle - HELP

[mikeb]

Hope someone can help with this.

I'm basically ripping apart a car model in order to add some weapons to it that can be activated by the driver.  What I would like is for the actual weapon (MG) to be concealed until it is armed.  When it is armed I want to create a simple animation that reveals the weapon.  From then on it can be fired or disarmed and conceal itself again.

Is there anyway of doing this.  If there is already something on the forum could someone please point me to it.  Haven't been too successful so far!!!

Thanks a lot!