Mossberg 500 Turkey Holosun Micro Dot Mossy Oak Greenleaf 20 Gauge 3in Pump Shotgun - 20in - When it comes to pump-action shotguns, Mossberg and the 500 Series set the standard. Its short cycling time lets you identify and point to a new target quickly and efficiently. And its overall simplicity means higher durability at a lower cost. Without question, the 500 is the most versatile shotgun platform available on the market - no wonder that over 12 million have been sold. This model is 20 Gauge. Optic-Ready (Shield RMSc pattern) Mounted Holosun HS407K (olive) Standard pump-action features include dual extractors, steel-to-steel lockup, twin action bars, and anti-jam elevator Adapt for Application with 500 Accessory Barrels Ambidextrous Safety