FN 5.7×28mm
The FN 5.7×28mm (designated as the 5.7×28 by the C.I.P. and 5.7×28mm NATO) is a small-caliber, high-velocity, smokeless-powder, rebated, non-tapered, bottleneck, centerfire cartridge designed for pistols and personal defense weapons (PDW) uses, manufactured by FN Herstal. It is similar in length to the .22 WMR and .22 Hornet.