The term "4.6×30mm" refers to a specific type of ammunition used primarily in firearms. The "4.6" indicates the bullet's diameter in millimeters, while "30mm" denotes the length of the cartridge case. This caliber is designed for high-velocity performance and is often associated with compact and lightweight firearms. This ammunition is notably used in the Heckler & Koch MP7, a personal defense weapon favored by military and law enforcement agencies. The 4.6×30mm cartridge is engineered to provide effective penetration and reduced recoil, making it suitable for close-quarters combat situations.