Sorry to the people that read my reply on an other thread, but my opinion:
Guns on flightdeck: NO WAY!
Before you know it the capt and FO having a contest who can clean the gun fastest. You need to do something after six hours flying from LAX to LHR.
"XXX123, Mayday, mayday, my capt just shot himself cleaning his gun!!"
ATC: "Say again
??