Editing FN P90 (section)

===NATO evolution===
{{further|FN 5.7×28mm#History}}

In 2002 and 2003, NATO conducted a series of tests with the intention of standardizing a PDW cartridge as a replacement for the 9×19mm Parabellum cartridge.<ref name="oliver2007">{{cite web|author=Oliver, David|year=2007|title=In the Line of Fire|url=http://www.global-defence.com/2006/Utilities/article.php?id=40|archive-url=https://web.archive.org/web/20061016074936/http://www.global-defence.com/2006/Utilities/article.php?id=40|archive-date=October 16, 2006|access-date=October 19, 2009|publisher=Global Defence Review}}</ref> The tests compared the relative merits of the FN 5.7×28mm cartridge and the [[HK 4.6×30mm]] cartridge, which was created by [[Germany|German]] small arms manufacturer [[Heckler & Koch]] as a competitor to the 5.7×28mm.<ref name="oliver2007"/> The results of the NATO tests were analyzed by a group formed of experts from Canada, France, the [[United Kingdom]], and the United States, and the group's conclusion was that the 5.7×28mm was "undoubtedly" the more efficient cartridge;<ref name="oliver2007"/> However, the German delegation and others rejected the NATO recommendation that 5.7×28mm be standardized, halting the standardization process indefinitely.<ref name="oliver2007"/><ref name="gourley2003"/> As a result, both the 4.6×30mm and 5.7×28mm cartridges (and the associated weapons) have been independently adopted by various NATO countries, according to preference; the P90 is currently in service with military and police forces in over 40 countries throughout the world.<ref name="milrev"/><ref name="gourley2003"/> The 5.7x28mm was finally standardized by NATO in February 2021.<ref name=":0" /><ref name=":1" />