Here's what I have on hand. Scalable of course to fit the situation. At the very minimum, I have two extra handgun magazines on my sam browne. If I need to deploy my rifle, the minimum load out to go with the rifle is a thigh rig with four extra 30 round magazines. If it starts to go sideways, my tac vest has three more 30 round M4 magazines, and two extra handgun magazines. If it gets worse, I have five more 30 rounders and a couple more handgun magazines that I can deploy.