The Mossberg 930 Waterfowl is a gas-operated autoloading shotgun that handles 2.75" and 3" shotshells. 930 models feature a quick empty magazine button for easy unloading, a cocking indicator that protrude from inside the trigger guard, and a drilled and tapped receiver for convenient scope base installation. Custom stock spacers, cocking indicator. Interchangeable Accu-choke tubes (M, F, IC) are included with these waterfowl models. The barrels are vent-ribbed and ported with a fiber optic front bead sight.