M3000 Series Defense Shotgun is a perfect choice. Like all the shotguns in the M3000 line, the M3000 Series Defense is powered by Stoeger’s Inertia-Driven system – a simple, ultra-reliable action that runs clean, fast, and reliably with vast array of different cartridges. The Inertia-Driven System uses fewer parts, and eliminates the need for gas cylinders, o-rings, and other complicated parts which makes it more reliable.