MarcoPolo 12 S 12 Gauge Semi-Auto Shotgun

The MarcoPolo 12 S is a 12 gauge gas-operated semi-automatic shotgun manufactured by Eternal Arms in Turkey — distinguished from every other semi-automatic shotgun in this collection by its detachable box magazine system rather than the conventional under-barrel tube magazine. This fundamental design difference enables faster reloads by swapping magazines rather than individually loading shells into a tube, making the MarcoPolo 12 S particularly practical for range use and training scenarios where reload speed matters.

The compact 18-inch barrel (457mm) keeps overall length short and manoeuvrable, combining with the tactical profile to make the MarcoPolo 12 S the most compact semi-automatic shotgun in this collection. The gas-operated action cycles reliably with standard 2¾-inch and 3-inch 12 gauge loads. The detachable magazine design allows different magazine capacities — standard configurations typically offer 5+1 or 10+1 depending on the magazine loaded — a flexibility not available with tube-fed designs.

The MarcoPolo 12 S is the most affordable semi-automatic shotgun in this collection — and the second most affordable shotgun overall after the ATA ETRO pump. For buyers who want semi-automatic cycling, detachable magazine convenience, and a compact tactical profile at the lowest possible price point, the MarcoPolo 12 S offers a unique specification combination that no other product in this collection provides.

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