The FN 5.7×28mm (designated as the 5.7 × 28 by the C.I.P.) is a small-caliber, high-velocity, smokeless powder, rebated rim, bottlenecked centerfire cartridge designed for handgun and personal defense weapon (PDW) uses and manufactured by FN Herstal. It is similar in length to the .22 WMR (Winchester Magnum Rimfire)(5.7×27mm) and to some degree similar also to .22 Hornet or .22 K-Hornet. Unlike many new cartridges, it has no parent case; the complete package was developed from scratch by FN.
The 5.7×28mm was developed in conjunction with the FN P90 PDW and FN Five-seven pistol, in response to NATO requests for a replacement for the 9×19mm Parabellum cartridge. 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. The tests compared the relative merits of the 5.7×28mm cartridge and the 4.6×30mm cartridge, which was created by Heckler & Koch as a competitor to the 5.7×28mm. The NATO group subsequently recommended the 5.7×28mm cartridge, citing superior performance in testing, but the German delegation objected and the standardization process was indefinitely halted.
By 2006, FN's 5.7×28mm firearms — the P90 PDW and Five-Seven pistol — were in service with military and police forces in over 40 nations throughout the world. In the United States, 5.7×28mm firearms are currently used by numerous law enforcement agencies, including the U.S. Secret Service.
In addition to being used in the FN P90 and FN Five-seven firearms, the 5.7×28mm cartridge has subsequently been used in a number of other weapons, such as the AR-57 and FN PS90 carbines. Excel Arms has developed four firearms chambered in 5.7×28mm, and MasterPiece Arms offers three different firearms in 5.7×28mm. In December, 2019, Ruger announced its new Ruger-57 semi-automatic pistol chambered in this cartridge. The 5.7×28mm cartridge itself is produced in a number of varieties, two of which — the SS195LF and SS197SR — are currently offered by FN to civilian shooters.
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