The Mk18 Mod0 is a hand-cranked 40mm grenade launcher developed in 1962 and used by the US Navy during the Vietnam War, primarily on patrol boats. Despite being considered obsolete upon introduction, its reliability and simple operation, featuring a split-breech mechanism and a unique Dacron belt, made it a favored weapon for close-range engagements up to 250 yards. It fired low-pressure 40x46mm rounds, offering a practical rate of fire between 100-200 rounds per minute with an impressive average of 5,000 rounds between stoppages.
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