The gun answers SPACE and ENTER — with tracers you can see d0ee2a7

Three fixes in one pass. The gun simply ignored SPACE — only the mouse trigger worked, because the fire code never looked at the keyboard for the Vulcan. Now SPACE and ENTER both fire the selected weapon (hold either for a burst), so weapon select moves to TAB, with 1 / 2 / 3 jumping straight to AMRAAM, Sidewinder or gun. And the tracers themselves are rebuilt: the old bolts were pencil-thin and effectively invisible from the cockpit, so each round now flies as a fat glowing bolt that reads day or night.