The Curtis XP-55 Ascender was commisioned/contracted as the P-55 in July 1940 in response to a US Army proposal of November 1939.
It's first flight was in July 1943. Though early problems came up, it was ultimately successfull but the Ascender fell victim to politics and old school attitudes. It was dropped before it was fully developed, also, test pilots were restricted from pushing it to it's limits so the world never really found out what it could do. . .
A special feature of the XP-55 was a propeller jettison lever located inside the cockpit to prevent the pilot from hitting the propeller during bailout.
Four .50 cals and it's performance curve make it perfect for CS if someone is willing to scratch it out.
Given the accelerated pace of aircraft development, Curtis Wright of Buffalo New York might be trying to sell these to the Empire state right now.