To not even think of cooling the tube of his mortar down, and just keep dropping them in (one after another without any thought of the heat build up) and only relying on Allah to cool it down, without any regard for his own life, is a great example that Muslims must honour!
NEVER THINK INDEPENDENTLY!
Only rely upon Allah and his divine countenance when engaged in JIHAD!
I would say he will probably gain a few more virgins than your average Martyr.
Lets say 82 virgins?