The P-39 was a marvel of engineering with a mid-mounted engine and a primary gun firing through the propeller hub. Because the US Army Air Corps wanted to save money, the supercharger originally fitted to the prototype was removed. This decision almost doomed the aircraft. The US no longer wanted it for a fighter role and the British summarily dismissed it altogether. Many of the airframes went to the Soviets under a lend-lease agreement where they found their niche as ground attack aircraft and low altitude fighters. This particular kit represents one of those lend-lease aircraft.
For the uninitiated, Halinski paper models are often referred to as the “Tamiya” of paper models. They are that good. Anyone who thinks paper models cannot rival plastic needs to experience one of these before making a conclusion.