The 7.5 cm BK (Bordkanone 7.5 cm) was a anti-tank cannon designed
and produced by Rheinmetall-Borsig
in 1943. The 7.5 cm BK was basically a Luftwaffe modified
7.5
cm PaK 40 designed to be mounted in a ventral gondola
pod beneath the aircraft fuselage and in an emergency could
be jettisoned, this weapon, a 10 round magazine.