"Frank Ch. Eigler" wrote

Whether that's "quick" or "a myth" depends on your point of view (and
on whether I did my estimations correctly).

What you failed to take into account, is that the engines keep applying
thrust, and will partially negate that issue, and that the gun is nearly
always fired while the airplane is in a rather steep descent (to get guns on
target), so there is more force to keep the airplane from slowing down.

So it appears as though it would take considerably more to slow the airplane
to stall speed, and it the guns fired much longer, they would be a molten
pile of metal, or out of ammo. Anyone remember how many seconds of ammo are
carried?

As to the engines ingesting the gun smoke, consider how much air they take
in. Massive amounts. Most of that is bypassed around the engine, so only a
little is burned. Even if some of the smoke is taken in, I doubt that it is
enough to make the engine even stutter.
--
Jim in NC