Mk.18

The Mk.18 is a short-barreled assault rifle developed by the US Navy, modified from the Colt M4 upper receiver and the M16A1 lower receiver to provide a more compact weapon for naval crews. Later, special forces also began using the Mk.18. The gun was initially intended as part of the SOPMOD program, offering two interchangeable systems: the 18-inch SPR (Special Purpose Receiver) for improved mid-range accuracy and the 10-inch CQBR (Close Quarters Battle Receiver) for close-quarters combat. However, due to the characteristics of the AR-15 system, reliability issues arose when quickly swapping systems. Nevertheless, both systems eventually evolved into independent weapons. In the game "Girls' Frontline," Mk.18 is a straightforward Tactical Doll with a deep love for marine life. She is beloved by players for her unique marine-life nicknames and cheerful personality. As a five-star Assault Rifle doll, she demonstrates excellent damage, accuracy, rate of fire, and health in the game.