Stoeger M3500 12 Gauge 3-1/2in Blued Semi Automatic Shotgun – 28in – Stoger’s M3500 series of shotguns delivers quality and performance at an unbeatable price. This ultra-reliable semi automatic shotgun is equipped with Stoger’s proven Inertia Driven System – a simple yet reliable action that differs from gas-operated semi automatics. The Inertia Driven System is composed of just 3 moving parts and eliminates the need for gas cylinders, O-Rings, and other complicated parts. Instead of using gas expansion, the Inertia Driven System uses recoil to cycle shells. This allows the M3500 to handle a massive assortment of different loads from light 2 ¾in cartridges to 3 ½in magnum shells. The Inertia Driven System also keeps the action cleaner since all the gas and burnt powder is expelled through the barrel. Other features include a drilled and tapped receiver for installing Weaver 93 style optics bases, and an included shim kit allows the shotgun to be adjusted to a perfect fit. In addition, the M3500 comes standard with an integrated recoil reducer in the stock, and a high visibility fiber optic sight promotes greater accuracy in low light conditions.