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The shorter length of the SS190 projectile allows it to be more conveniently used in the 5.7×28mm FN Five-seven pistol, which was also being developed at that time. [6] In 1993, FN introduced a modified version of the P90 with a magazine adapted to use the SS190 cartridge. [6]
The FN P90 and Five-seven pistol are used by military and police forces in over 40 countries, including Canada, Cyprus, France, Greece, India, Peru, Poland, Spain, and the United States. [28] The Heckler & Koch MP7 is also used in a number of countries, including Austria, France, Germany, Ireland, Norway, Malaysia, and the United Kingdom. [29] [30]
FN Herstal was the first small arms manufacturer to respond to NATO's requirement; FN started by developing a shoulder-fired personal defense weapon, the P90, along with a small caliber, high velocity 5.7×28mm cartridge type. [16]
The length of the barrel (especially for larger guns) is often quoted in multiples of the caliber, used, for example, in US naval rifles 3 in (76 mm) or larger. [2] The effective length of the barrel (from breech to muzzle) is divided by the barrel diameter to give a dimensionless quantity.
FN Herstal was the first small arms manufacturer to respond to NATO's requirement; FN started by developing a shoulder-fired personal defense weapon, the FN P90, along with a small caliber, high velocity 5.7×28mm cartridge type. [1] The original 5.7×28mm cartridge, called the SS90, went into production with the P90 in 1990. [24]
The P90 is a scaled-up version of the P89 chambered in .45 ACP with an investment cast aluminum alloy frame. It was introduced in 1991 as the company's first attempt at a .45 ACP pistol, and was in direct competition with SIG Sauer's P220 , Smith & Wesson's 4500 series, and to a lesser extent Glock's G21 that came out the same year.
The AR-57 PDW upper is a new design on AR-15/M16 rifles, blending the AR-15/M16 lower with a lightweight, monolithic upper receiver system chambered in 5.7×28mm. This model is also sold as a complete rifle, supplied with two 50-round P90 magazines. [1]
The MP7 went into production in 2001, and is a direct rival to the FN P90, also developed in response to NATO's requirement by Belgian company FN Herstal. The weapon has been revised since its introduction and the latest production variants are the MP7A1 and MP7A2 .