The FN-designed 5.7x28mm caliber, standardized in 2020 by NATO, was originally designed in the late 1980s for use with the military issued FN P90 and FN Five-seveN pistol. With three decades of trusted use, the FN 5.7x28mm drastically improves range, accuracy and terminal performance from small arms with the groundbreaking bottleneck pistol cartridge. Perfected for operability with FN firearms, feed and eject reliability, consistent velocity and unmatched repeatability are standard issue with all FN 5.7x28mm ammunition.