After the Benelli inertia system patent expired, we’ve seen an explosion in the number of shotguns using their system. It’s easy to see why: they’re simple in number of parts, clean shooting, and very reliable. The Girsan MC312 is an inertia-driven, semi automatic shotgun made in Turkey. It’s budget priced (I got this one on sale for cheap from Cabela’s) and copies a lot from the Benelli M2. In the US, these are imported by EAA and were selling for as low as $300 at one point.