In that case why does a .45 pistol hurt my wrist so much when I pull the trigger.
A 170lb pilot leaving an aircraft on a Mk 3 seat leaves the end of an 8 foot gun at 80 ft/sec. That is a 25G acceleration. 25X170 lbs is a 4,250 lbs force at the front of the aircraft. That is 2 tons hitting it in 1/10th of a second. It used to, as has been proved, moved Javelins.
Fly something like a B25 Mitchell and have a 4,000lb bomb inadvertantly land on your cockpit. You would certainly notice that.
MB , and others, had the advantage of expecting it