BTW, and FWIW, barometric initiator is NOT required. A timer, a remote control, or a delay switch, a couple of batteries, a blasting cap and the shaped charges stolen from the locker in Houston is all that is needed.
YOU proposed that shooting it down would be EASY, show me what part of the engine you need to hit.
A 50 caliber shot straight head on into the spinning turbine blades is all it would take, believe me.
Titanium turbine blade spinning at a gazillion RPM are NOT made to take 50 caliber rounds in stride.