So I tried another avenue using devices and markers.
I have a marker that I tried using. I had it set so that when my light ammo hits zero, it initiates the hud message and item granter. This did not work. But I tried something else as an attempt to see if things were working as intended.
So there is an item granter that initially hands you a pistol when the match starts. So I set the marker to check to see if the player has a pistol and if so initiate the hud message and the next item granter. That worked… So I guess my issue is in fact, and inability to accurately track ammo.