This specific cartridge designates a projectile measuring 5.7mm in diameter, paired with a 28mm-long case. This relatively small, high-velocity round is typically loaded with specialized projectiles designed for optimized performance in specific firearms, often personal defense weapons (PDWs). A common example is its use in the FN P90 and the Five-seveN pistol.
The advantages of this particular cartridge include its flat trajectory, reduced recoil, and ability to penetrate certain types of body armor. Developed in the late 1980s as a response to the need for a more effective personal defense round for support troops, it bridges the gap between traditional pistol cartridges and rifle cartridges. This has led to its adoption by military and law enforcement agencies worldwide.