So I am attacking some slow movers using the gun, I approach the slow movers from behind, flick the master arm switch, lock the target on the radar, flip the guns switch to on and proceed to send the slow mover to meet its maker, however, I then switch off the gun, jettison the center-line external fuel tank because it is empty, switch the gun back on and after that I cannot lock onto the next target and my guns will not fire.
I looked around the forums and didn't see any reference to this type of problem. Am I missing a procedure of some kind?