The bayonet adaptor is configured to both engage an integral barrel lug as well as act as a split clamp around the muzzle, giving it an extremely tight fit resistant to developing play or rotation, with a rifle style blade front sight. Deviating from the typical layout used by most American trench guns, the Stevens uses a multi-piece adaptor and shield configuration. To this was added a bayonet adaptor and a heat shield, to give the arm a close-combat capacity a standard sporting shotgun lacked. Browning's core design was rugged and reliable, with an internal hammer to prevent pinching and snagging, and a well-designed takedown mechanism. A very late entry into the field of First World War fighting shotguns, the Stevens Model 520 Trench Gun was an improvement from a base sporting design created by John Browning, which had a number of virtues for combat work.
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