The P90 was developed between 1986-1990 by Belgian company FN Herstal and first saw use in the Gulf War by the Belgian Special Forces Group.
Further development has led to the creation of the P90 TR variant. This variant was introduced in 1999 and continues to be offered alongside the standard P90.
The P90 is a short, compact, lightweight bullpup weapon, chambered in 5.7x28mm. It takes a 50-round magazine; the magazine feeds from the top, and the weapon fires from a closed bolt. The P90 has a 10.5 inch barrel, with a flash hider mounted. It uses the straight blowback mode of operation, and the weapon cycles at a rate of 900 rounds per minute. All models of the P90 can take suppressors.
The P90's receiver is polymer, and can come in a few different colors - olive drab and black being the most prevalent.
The P90 has a few variants.
This variant is basically the same as the P90; however, it has a 16-inch barrel, and the option of automatic fire is removed.
FN P90 LVEdit
P90 with an integral laser mounted in front of the trigger guard, just below the barrel. This laser can either be visible or infrared; infrared lasers are for use at night, in conjunction with night vision equipment (as that is the only way the light can be seen).
The regular laser has three settings: off, low power, and full power.
FN P90 TREdit
This P90 features a rail on top of the receiver, and two rail sections on the sides of the receiver. The top rail is integral.