The 7.5 cm Leichtgeschütz 40 was a recoilless gun used by the German Army during World War II.

This meant that its ammunition could not be optimized to benefit from the peculiar ballistic characteristics of recoilless weapons.

This was principally caused by the torque imparted to the mount when the shell engaged the rifling as well as by the erosion of the nozzles by the combustion gases.

These could be countered by welding vanes inside the nozzles that were curved in a direction opposite to the rifling which would then counteract the torque exerted by the shell and minimizing the stress on the gun mount.

The 500th SS-Fallschirmjäger Battalion used four examples during its airdrop on Josip Broz Tito's headquarters at Drvar.