A 5.7x28mm SS197SR round on the feed tray of a 50 round magazine as used in the P90 sub machine gun.
Source: www.sgcusa.com -
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The 5.7x28mm round is a pistol cartridge of Belgian origin. It was developed by Fabrique Nationale in the 1980's for use in the P90 sub machine gun. The 5.7x28mm round was the first small caliber high velocity pistol cartridge. The most direct competitor is the 4.6x30mm round developed by Heckler & Koch for the MP7 machine pistol.
The 5.7x28mm is based upon the 5.56x45mm SS109 NATO round, which was also developed by Fabrique Nationale. The case and bullet are reduced in size to create a performance in the 9x19mm range with much improved armor piercing capability. Unlike most pistol cartridges the 5.7x28mm has a long and slim design with bottlenecked case and pointed bullet design. The 5.7mm has only a third of the recoil of the 5.56mm NATO and two-thirds of the 9x19mm. The 5.7x28mm allows for a higher magazine capacity than other alternatives for the 9mm, such as the .40 S&W and .357 SIG rounds.
The 5.7x28mm round was designed for the P90 sub machine gun. The P90 has a unique design since it uses a 50 round translucent magazine that lies on top of the weapon. The Fiveseven pistol with conventional 20 round magazine also uses the 5.7x28mm round.
The 5.7x28mm round provides nearly the same lethality as the 9x19mm round. It is very good at piercing armor since it is able to pierce 1.6mm titanium plus 20 layers of kevlar out to 150 meters, which corresponds to most combat body armor and helmets. The maximum effective range is 200 meters for both the FMJ and JHP rounds. The SB193 has a much reduced range of 50 to 100 meters and the V-max bullets can be used out to 150 meters.
The 5.7x28mm round is mainly used by law enforcement units around the world, but mainly in Europe and the USA. The P90 is also in use with special units in the military. In some nations 5.7mm weapons are available to the public with not all types of ammunition being freely available.
A box of 5.7x28mm L191 tracer ammunition.
Source: TehVice -
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The first generation of 5.7x28mm ammunition was developed for military use. The SS190 remains the main round fired from 5.7mm weapons and is the most produced of all 5.7mm ammunition.
A box of 5.7x28mm SS195LF ammunition.
Source: Metroplex -
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The second generation of 5.7x28mm ammunition was developed for the US law enforcement and civilian market. The LF rounds may be used for training and law enforcement use and the sporting rounds are for civilian use since armor piercing ammunition is prohibited in the USA.
The 5.7x28mm cartridge was specifically developed for use in the FN P90 personal defense weapon. The P90 remain the major platform for the 5.7x28mm to this date.
The Five-seveN pistol is chambered for the 5.7x28mm cartridge. It has a magazine capacity of 20 rounds with a magazine that is flush to the pistol grip. The pistol grip is rather long due to the dimensions of the ammunition.
The 5.7x28mm cartridge was inspired by the 5.56x45mm NATO round. The SS109 round was developed by FN in the 1980's.
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