Such action could result in the user losing control of the gun or catastrophic breech explosions. 'Slam-firing' - the unintentional discharge of the weapon - was possible with the M520 as disconnects were not en vogue with such guns at the time. The M520 utilized a tubular magazine housing five total shells - a shell could be chambered, ready-to-fire, for six shell total capacity. The slide handle was also checkered for a sure grip. The stock was of checkered walnut with the pistol grip integrated and a rubber butt plate fitted as standard. The guns arrived with a wooden stock/grip unit and wooden slide. The receiver was of drop-forged manufacture and covered in a matte finish. A firing pin safety was coupled with an independent safety. The action utilized a hammerless arrangement with locking block and side ejection of empty shells. Barrels were of high pressure compressed steel with full choke in lengths of 28- (standard) and 30-inches.
The M520 name designated an entire line of shotguns from Stevens that included the standard 12-gauge take-down form. Its general form and function were highly conventional while reliability and construction held in generally high regard for the time - though some questioned the type's overall complexity. The Stevens Model 520 (M520) was a pump-action slide shotgun appearing around 1910.
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