The Bell P-39 Airacobra was an innovative, heavily armed US fighter from WW2. Early versions had a centre mounted 37mm cannon while later versions had a lighter but faster firing 20mm cannon. In addition a mix of 0.5" and 0.3" machine guns were carried as well as provision for bombs for the fighter bomber role. The type performed poorly at altitude and its climb rate wasn't good. These factors meant it was rejected by the RAF, who preferred the faster climbing, better performing Spitfire. However it was quite good at medium and lower altitudes and was used with some success in the Pacific by the USAF and very successfully by the Russian Air Force on the Eastern front, where most of the air combat was at lower altitudes. The P-400 was a UK spec P-39 with a 20mm cannon in the nose and 0.303 machine guns in the wings. They were operated by the USAAF after the RAF rejected them.
Eduard are a Czech based manufacturer famed for their model accessories who have in the last few years released a successful range of kits. There are markings for 2 aircraft of the USAAF.