it is very true, the Mirage is unfortunately unrealistic as for its ability to resist to gun impacts. it is more like a "Tank". this as a whole, make the dynamic of the aircrafts in the DCS environment unrealistic. Some Dogfights tournaments even bans the Mirage to enter their competitions exactly for that reason. I believe that it is time for the Mirage to be equally resistant to impact like the other aircrafts in DCS, no more, no less.