soc.history.war.world-war-ii

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> Almost certainly the Henschell Hs 129 B2/R4 which mounted a 7.5cm PAK
> 40L autocanon with 12 rounds. It could knock out any tank in the
> world.


http://www.warbirdsresourcegroup.org/LRG/hs129.html

Hs 129B-2 Series:
Two 13mm MG 131 Machine Guns in nose.
Two 20mm MG 151/20 cannon in nose.
Various weapons were fitted inclusding 37mm BK 3.7 and 75mm BK 7.5. An
interesting weapon was a battery of six 75mm smoothbore recoiless rifles
that fired downawrds and to the rear. This system was fired by an automatic
magnetic trigger that fired when the aircraft flew over metal objects. This
system was reported to be quite successful.

Jane's All The Worlds Aeroplanes
has much the same as Warbirds above, but neither
refer to the 7.5 cm PAK 40L in the Hs 129B**
which is odd because there are other web sites that
do refer to it as you described, some with cutaway
drawings. One of the sites stated that 26 such
systems were built.