The Weatherby 18i Synthetic in 12 gauge (brand part no. ISY1228SMG) is an inertia-driven semi-automatic shotgun built around a 28-inch barrel with a 3.5-inch magnum chamber, giving high-volume shooters a reliably cycling, evenly weighted platform. Weatherby machines the 18i’s single-piece receiver from billet aluminum and pairs it with an advanced polymer stock featuring a soft-touch cheek rest and textured gripping surfaces. Among semi-auto shotguns in the semi-auto shotguns category, the 18i favors shooters who want proven inertia-driven reliability for high-volume shooting.

Key Specifications

• Chambered in 12 gauge with a 3.5-inch magnum chamber.
• Operates on a proven inertia-driven semi-automatic system.
• Features a 28-inch barrel.
• Built with a single-piece billet aluminum receiver.
• Equipped with a high-luminosity LPA fiber optic front sight.
• Safety sits behind the trigger with a red-ring visual indicator.
• Finished with a black synthetic stock.
• Ships with five choke tubes and a wrench in a carrying case.

Frequently Asked Questions

How does this shotgun cycle? A proven inertia-driven system built into a single-piece billet aluminum receiver.

How many chokes are included? Five choke tubes plus a wrench, contained in a carrying case.

Buy the Weatherby 18i Synthetic 12 Gauge Shotgun

Proven inertia-driven reliability for high-volume shooting is exactly what the 18i delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.