Fabrique Nationale d'Herstal, commonly known as Fabrique Nationale, or simply FN, is a renowned Belgian arms manufacturer located in Herstal, Belgium. The company was originally established in 1889 as the Fabrique Nationale d'Armes de Guerre – French for "National Factory of Weapons of War" – to produce 130,000 Mauser Model 89 rifles for the Belgian government.

Today, FN Herstal is known for their unique yet successful designs that have found homes in the armed forces of more than 100 different countries, which speaks volumes about the manufacturer's reputation for high quality, reliability and performance. They also have an American division, FNH USA, which is headquartered in McLean, Virginia with manufacturing operations situated in Columbia, South Carolina. It is there that the company manufactures the FN PS90.

Originally developed as a selective-fire personal defense weapon alongside the 5.7x28mm cartridge in response to NATO requests for the replacement of all firearms chambered for the 9x19mm Parabellum cartridge, the FN PS90 is a compact, versatile firearm that features a unique bullpup design and utilizes a straight blowback action that fires from a closed bolt. Recently, they have been quite hard to come by, as have their magazines.

As noted, the FN PS90 magazine is an FN Herstal factory-produced magazine for the FN PS90 and FN P90 platforms. The magazine is designed to hold and feed 30 rounds of 5.7x28mm ammunition. Its impact-resistant, semi-transparent polymer body is incapable of succumbing to rust or other corrosion. Also noteworthy is the unique design. This top-mounted longitudinal magazine fits flush with the frame of the firearm and features a spiral feed ramp that rotates cartridges 90 degrees prior to loading them into the chamber. As is expected, this magazine benefits from the performance and reliability that has become characteristic of all FN Herstal factory products and is guaranteed to fit and function in your firearm.

Generally speaking, it is beneficial to seek out original factory magazines like the FN PS90 magazine for your firearms. Original factory magazines are manufactured by the same company to the exact same specifications and tolerances as those that ship with the firearms for which they were designed. They are also made from the same materials, which ensures both fit and function in your firearm.