This is the Derya DY12 12-gauge 21-round drum magazine. It also fits standard AR-12 shotguns, such as DY12, MKA1919, VR80, X12/F12, Boss, and others.

This drum mag can take a beating, built with a durable polymer drum, a translucent rear cover to see rounds, and a steel magazine tower. Plus, it features a hand-crank load assist for faster loading.

This is the highest capacity drum for AR-12-style shotguns on the market.