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In page Riding shotgun:

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When Wells, Fargo & Co. began regular stagecoach service from Tipton, Missouri to San Francisco, California in 1858, they issued shotguns to its drivers and guards for defense along the perilous 2,800 mile[citation needed] route.[1] The guard was called a shotgun messenger and they were issued a Coach gun, typically a 10-gauge or 12-gauge, short, double-barreled shotgun.[2]