The Bristol normal guns characteristic is "1 f, 1 o". If you have "0 f, 1 o" you have lost the frontal gun. If you have "1 f, 0 o" you have lost the rear gun. Easy.
Mmmm... not really so. From what I know, the "1 gun lost" chit can only affect forward machine gun(s), while the only chit affecting the observer is the "Observer killed" one, and even in that case the plane will show "1 o". Bye !!!
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