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The P90's barrel is cold hammer-forged and chrome-lined, with an overall length of 263 mm (10.4 in). [8] The barrel has eight rifling grooves with a right-hand twist rate of 1:231 mm (1:9.1 in), and it is equipped with a diagonally cut flash suppressor that also acts as a recoil compensator.
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 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]
In C.I.P. regulated countries, every rifle cartridge combination has to be proofed at 125% of this maximum C.I.P. pressure to be certified for sale to consumers, referred to as "PE". This means that 5.7×28mm chambered arms in C.I.P. regulated countries are currently (2018) proof tested at 4,313 bar (431 MPa; 62,555 psi) PE piezo pressure. [ 7 ]
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 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]
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