A revolving gun of six or eight shells can be made with greater speed. Long guns are accurate, short fire shells an equal distance. I want rapid fire into the high atmosphere to shock wave ahead of warheads, they can also deliver GPS data to the ICBM releasing them. Neither option requires a long barrel. This is adequate, altimeter, autofire, binocular offsite locating
Pathetic defences of London can be seen occasionally, rocket tubes.
It is essential to turn off all radio transmition devices other than firing, perhaps take them to a local area, jam.
SIS: Doesn't look bad
Only seen three travelling London.