The Mossberg® 930™ Hunting All-Purpose Semi-Auto Shotgun features a 3" chamber, and a dual-vent gas system that cycles the full spectrum of shotgun loads from 2-3/4" field loads to 3" magnums. A vent rib with a single fiber-optic sight gets you on target instinctively. The receiver is drilled and tapped for mounting an aftermarket optic sight. Hunters can operate the top-mounted safety.