Macchi C.206 & C.207

The Macchi C.206 was an Italian World War II fighter designed by Mario Castoldi and built by Macchi.
Only one prototype was built, in order to cope with the major flaw of the previous Macchies, the lack of heavy weaponry. It was powered by a single Daimler Benz DB 603 delivering 1750hp of power and was armed with two 12,7mm Breda-SAFAT machine guns plus three 20mm cannons. However, the only built prototype was destroyed in an Allied air raid on the factory in 1943, together with the another prototype, the Macchi C.207 which was similar to the C.206 but it was armed with four 20mm guns placed in the wings.

Sources:
1. https://it.wikipedia.org/wiki/Macchi_M.C.206 (translated)
2. http://forum.worldofwarplanes.com/index.php?/topic/1852-aermacchi-c207/