Are tail-gunners bullet-proof?

[MD_Titus]

hitbox for gunners is pretty small, iirc from using arcade=1. as in rifle calibre bullets have to hit their heads. fragments from explosive shells can kill them as well.

there was/is a quirk with the ju88 for example, where getting a rear gunner kill also takes out the pilot.

ju87 and bf110 gunners appear to have a secondary role of armour for the pilot, they die that often.