Fitted with a Henry Brewer’s patented heat shield and John Otterson’s sword bayonet mount for the M1917 bayonet. Stevens developed a military version of their Model 520, but the war ended before production began. While the US military did not purchase the Model 520 during the First World War, the Model 520-30 was purchased in large numbers during the Second World War.

With America’s entry into the First World War, the US military called for a trench shotgun. Steven’s offered the Model 502 in various gauges, including 12, 16 and 20 gauge during its production run.Ī page from a pre-war Stevens catalogue showing two Model 520 sporting shotguns ( source) The Riot and later Trench Gun models had 20 inch barrels, 5-round tube magazines and weighed approximately 8lbs (3.6kg). The position of the 520′s safety moved several times, initially inside the trigger guard, then moved behind the trigger guard on the left side and finally, with the Model 520A the safety moved to the shotgun’s tang. The Model 520 had a unique take-down barrel and locking breech block system which, once the slide was opened, the magazine tube could be unscrewed which freed the receiver from the barrel and magazine assembly. The Model 520 is a ‘hammerless’, pump action shotgun with a bolt that locked into the top of the receiver, similar to one of Browning’s patents filed before the turn of the century. Based on two patents filed in 19, Stevens Arms Company bought the rights to the design and began production in 1909. The Stevens Model 520 is one of John Browning’s lesser known shotgun designs.

Stevens 520 serial numbers