Few accessories are available specifically for the Stevens 320 shotgun, however, since it is a clone of the Winchester 1300, most accessories for the Winchester fit the Stevens 320. Additionally, Amazon sells a 25-round ammo sling built for the Stevens 320.
Elastic buttsock shotshell holders, such as those available from Cabela's, are compatible with pump shotguns such as the Stevens 320. The Truglo Home Defense Fiber Optic sight is designed for plain barrel shotguns and snaps over the existing sight to provide easier aiming in the dark. Finally, Field Sport offers a five-position shotgun barrel mount with three Picatinny rails that allow owners to equip the Stevens 320 with compatible accessories such as flashlights and laser sights.