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The FN P90 is a selective fire personal defense weapon (PDW) designed and manufactured by FN Herstal in Belgium.[9] The P90's name is taken from 1990, the year it was introduced.[4] The P90 was created in response to NATO requests for a replacement for 9×19mm Parabellum firearms; it was designed as a compact but powerful firearm for vehicle crews, operators of crew-served weapons, support personnel, special forces and counter-terrorist groups.[9][10]

The P90 was designed by FN in conjunction with the FN Five-seven pistol and FN 5.7×28mm ammunition.[4] Development of the P90 began in 1986, and production commenced in 1990, whereupon the 5.7×28mm ammunition was redesigned and shortened.[1] A modified version of the P90 with a magazine adapted to use the new ammunition was introduced in 1993, and the Five-seven pistol was subsequently introduced as a companion weapon using the same 5.7×28mm ammunition.[11]

The P90 was developed and initially marketed as a personal defense weapon, but it could also be considered a submachine gun or compact assault rifle.[12] Featuring a compact bullpup design with an integrated reflex sight and fully ambidextrous controls, the P90 is an unconventional weapon with a futuristic appearance.[12] Its design incorporates several innovations such as a unique top-mounted magazine and FN's small-caliber, high-velocity 5.7×28mm ammunition.[12]

The P90 is currently in service with military and police forces in over 40 nations, such as Austria, Brazil, Canada, France, India, Malaysia, Poland, and the United States.[13] In the United States, the P90 is in use with over 200 law enforcement agencies, including the U.S. Secret Service.[14] The standard selective fire P90 is restricted to military and law enforcement customers, but since 2005, a semi-automatic carbine version has been offered to civilian shooters as the PS90.[15]

Source - Wikipedia :

http://en.wikipedia.org/wiki/FN_P90