"The TriStar Arms Matrix Semi-Auto Shotgun is the first to feature the excellent Inertia Driven system for incredibly fast, reliable cycling of everything from 2-3/4"" field loads to 3"" magnum loads with no adjustments. The Inertia Driven system runs cleaner and cooler than traditional gas systems because it doesn't spray gas and carbon into the action. The Matrix also features an oversized operating handle, slam-button bolt release, and fiber-optic front sight for easy targeting. Includes 3 chokes (IC, M, F). Inertia Driven system cycles a variety of loads Oversized operating handle Slam-button bolt release Fiber-optic front sight Includes 3 chokes (IC, M, F)"