So you have 80 PPSH each with a 30ish round mag - so you probably get 1 burst from all of them? 2400 rounds on a single target area. Not sure this is really much good compared with a standard fighter with say 8 forward firing belt-fed MGs which with just 2 belts of 250 would give you 4000 rounds - and the option to do multiple bursts.
Reloading wouldn't be easy either