I believe Action do a flicker unit to simulate arc welders, gun flashes,etc.
as for the elevating guns,you will obviously have to pivot the barrel
use some small expansion springs to help return the guns to their stop
position, fix fishing line onto the rear or the gun and run it to a servo arm
so that when the servo is operated you get a seesaw action with the spring
returning the guns back to their stop, and the servo elevating them.
you can run the line through tubes to avoid any tangles.
Doing it that way you can elevate as many guns as you want.
Action also do an adjustable servo morph that stretches the servo movement
and slows it down to your chosen speed
hope this has helped, its how I would do it anyway.
john
