The Weatherby 18i Synthetic (Weatherby part no. ISY1228MAG) is a 12 gauge semi-automatic shotgun built for hunters and shooters who need dependable cycling in rough field conditions. It runs on Weatherby’s field-proven inertia recoil system, pairing an evenly weighted feel with a 3-inch chamber that lets the 18i cycle everything from light target loads to small-game rounds without a hitch. The matte black synthetic stock and forearm shrug off weather and abuse, making this a practical choice for the upland woods, the duck blind, or the sporting clays line. Every 18i ships with a chrome-lined bore and chamber for easier cleaning and long-term corrosion resistance.

Key Specifications

• Chambered for 3-inch shells, covering the full range of standard 12 gauge target and field loads.
• Ships with a 4-round capacity, reducible to 2 rounds with the included magazine-limiting plug for migratory bird compliance.
• Fitted with a 28-inch barrel for a balanced swing on crossing birds and clays.
• Cycles on a field-proven inertia recoil system that keeps the action running with minimal felt recoil.
• Chrome-lined bore and chamber resist corrosion and simplify cleaning after a hard day afield.
• Features an elastomer-coated synthetic stock and forearm that further cut down on felt recoil.
• A red ring safety release button gives a clear visual and tactile indicator of the gun’s status.
• Topped with a full-length ventilated rib and LPA fiber-optic sight for a fast, repeatable sight picture.

Frequently Asked Questions

What gauge and chamber does the Weatherby 18i Synthetic run? It is a 12 gauge shotgun with a 3-inch chamber, suited to standard field and target loads.

How many rounds does it hold? The magazine holds 4 rounds, or 2 with the included limiting plug installed for waterfowl seasons.

What finish does the stock come in? A matte black elastomer-coated synthetic stock and forearm designed to reduce felt recoil.

Buy the Weatherby 18i Synthetic 12 Gauge Semi-Auto Shotgun 28-inch Barrel

The 18i Synthetic is a straightforward, no-frills semi-auto built to run reliably season after season. Backed by Weatherby‘s reputation for field-tested performance, it fits hunters who want a shotgun that just cycles, shot after shot. Browse our full lineup of semi-auto shotguns and order yours from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.