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This gun and vehicle were designed with a slide rule.
I was there.
The math for the hydraulic recoil taper is really hard.
The math for the barrel vertical balance and swing balance [equilibrator] is worse.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps