The MP40 (Maschinenpistole 40, German for "Machine Pistol 40") was the standard Sub-machine gun of the European Axis Forces during World War II. It was designed by Heinrich Vollmer for the German army. The MP 40 is an iconic image from the Second World War; so it often features prominently in war movies.
In Battlefield 1942, the Mp 40 is issued to the Wehrmacht and Afrika KorpsMedic kits, with four extra magazines. It has a good rate of fire, medium damage, low recoil and low accuracy. It remains a very effective close-quarters weapon, but it is relatively ineffective at long ranges as its accuracy deteriorates quickly; even going prone and firing in bursts will frequently result in wasting ammo.
In Battlefield Vietnam's official WWII mod, the Mp 40 is issued to the Imperial Japanese Army's Medic kit. It has a different model and different reload animations from its Battlefield 1942 counterpart, but is very similar in performance and stats.