The Adamson Marco Polo is a bullpup-style semi-automatic 12 Gauge shotgun with an 18-inch barrel and a 3-inch chamber. The bullpup layout keeps the overall length short despite the full-length barrel, and the gun pairs a synthetic stock with an aluminum receiver. Adjustable iron sights and a Picatinny rail give it a configurable sighting and accessory setup, and a fixed cylinder mobile choke handles the barrel's constriction.