Step 1...move very slowly to get your gunFor whatever reason, your SA drops or you are distracted by some outside factor. A BG gets the drop on you and has a gun pointed at you. He's demanding wallet and jewelery from your GF/wife.
In the process of giving up your stuff, the BG sees that you have a concealed gun (printing, shirt un-tucked, inside jacket, whatever)
Now BG demands that you hand over the gun too. What do you do?