The Model 58 was Remington’s first gas-operated, semi-automatic shotgun. It featured a magazine cap that you turned to adjust the size of the gas ports to allow the appropriate amount of gas to cycle the action for light and heavy loads. Because the gun was introduced in 1956, when everything was “-A-Matic,” the feature was of course called “Dial-A-Matic” load control. The Model 58’s gas system was located inside the magazine tube, limiting its magazine capacity to two shells.

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