The "4.6x30mm" is a type of ammunition primarily used in firearms designed for compact and lightweight applications. It features a bullet diameter of 4.6 millimeters and a cartridge length of 30 millimeters. This caliber is known for its high velocity and low recoil, making it suitable for both military and civilian use. Originally developed for the Heckler & Koch MP7, the 4.6x30mm cartridge is designed to penetrate body armor while maintaining accuracy at short to medium ranges. Its unique design allows for effective performance in close-quarters combat, contributing to its popularity among special forces and law enforcement agencies.