The MK 103 is a German 30mm autocannon developed in parallel to its smaller sibling, the MK 108 as a dual-purpose anti-air and anti-tank weapon. It served in the latter half of the Second Weltkrieg, particularly with high-performance fighters and attacker aircraft. By using HEHC Shells (or minengeschoss in Luftwaffe service) ammunition, the MK 103 achieved disproportionate firepower in comparison with other autocannons of the era.