Make tank drones starting ammo random from 0-40. So that you could be lucky and find a drone thats out of ammo or only have 1 shot left.
Tank drones don’t use ammo.
Got the idea after reading this thread: http://smf.cataclysmdda.com/index.php?topic=344.msg183819#msg183819
Bot flamers and tazers don’t currently check for ammo. Guns, grenades, and HEAT rounds do. Sorry, Blaze.