BudsGunShop.com - Inertia or Gas

Stoeger M3000 is an (recoil operated) inertia-driven operation shotgun. I hope this helps!

solidly constructed M3000 shotgun will more than fulfill your hunting needs. It’s the perfect choice for waterfowl, wild turkey, or upland game birds. For reliability and performance, no other semi-auto in its price range compares to the rugged, practical M3000.
3-inch, 12-gauge, Inertia Driven® semi-automatic
Handles loads up to 3-inch magnums without adjustment
Drilled and tapped to accommodate Weaver-style scope bases
Ventilated, stepped rib and fiber-optic front sight on the barrel for quick target acquisition, even in low light
stoegerindustries.com/m3000-shotgun

Inertia, or recoil operated.

The Stoeger M3000 uses an inertia-driven operation. Unlike most automatic shotguns which are gas-operated and use burning propellant from fired shots to cycle, inertia-operated guns work more like semi-automatic handguns.

John, the Stoeger uses an inertia-driven operation. Unlike most automatic shotguns which are gas-operated and use burning propellant from fired shots to cycle, inertia-operated guns work more like semi-automatic handguns.