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The Weatherby 18i Synthetic is a no-nonsense, field-ready semi-automatic shotgun built around a proven inertia operating system. Manufactured in Italy by Marocchi, it's chambered for 3.5" Super Magnum shells, giving you the flexibility to run light 2-3/4" upland loads all the way up to heavy magnum steel or bismuth waterfowl rounds without changing guns. The single-piece receiver is precision machined from billet aluminum, and the whole package comes in at 7 lbs with a 28" ventilated rib barrel — a solid balance of pointability and weight for a full day in the field.
The inertia system is the heart of this shotgun. Unlike gas-operated designs that redirect powder gases back into the action, the 18i uses the energy from the recoiling gun itself to cycle the bolt. The practical benefit is real: less carbon fouling builds up inside the action, which means the gun stays cleaner longer and requires less maintenance between hunts. It's the same operating principle that has made Italian-made inertia guns a staple in duck blinds and pheasant fields for decades. The 18i has been run through marshes, mud, snow, and sleet in real hunting situations and has consistently cycled reliably across shell types.
The polymer stock is shim adjustable at the buttstock, letting you dial in drop at comb to get a consistent cheek weld and a natural point of aim without sending the gun off to a gunsmith. The soft-touch cheek pad and aggressive texturing on the grip and forend keep things comfortable and controlled whether you're wearing gloves in a cold blind or working a hot dove field. The crossbolt safety sits right behind the trigger with a red indicator ring so you always know your status at a glance. Length of pull measures 14-1/3" and overall length comes to 49-1/4", making this a comfortably sized gun for most right-handed adult shooters.
The 18i ships with five CRIO Plus flush-fit choke tubes — Cylinder, Improved Cylinder, Modified, Improved Modified, and Full — along with a choke wrench and storage case. That full set covers you from close-flushing upland birds to tighter patterns for longer crossing shots on ducks and geese. The receiver is drilled and tapped if you want to add an optic down the road.
The 18i holds 4+1 rounds out of the box. It also comes with a magazine limiting plug that reduces capacity to 2+1, which is standard for many hunting situations. The plug is easy to install or remove depending on your needs.
The 18i has a solid track record with light loads, which is a genuine concern with any inertia gun. Field reports and reviews consistently note that it cycles light 2-3/4" loads without issue alongside heavier hunting shells. That said, as with any inertia-driven semi-auto, a firm shoulder mount helps the action do its job reliably.
The 18i uses the CRIO Plus choke system, which is a Benelli-pattern flush-fit thread. Many aftermarket extended and flush chokes designed for the CRIO Plus system are compatible, giving you good options for specialized waterfowl or turkey chokes beyond the five that come standard with the gun.
Yes, the stock includes a shim kit that lets you adjust drop at comb across four positions (1.9", 2.1", 2.3", and 2.5") to fine-tune how the gun fits your face and shooting style. It's a straightforward adjustment that doesn't require a trip to a gunsmith.
The 18i is manufactured in Italy by Marocchi, a company with roots going back to 1922, built to Weatherby's specifications. Italian craftsmanship in the inertia shotgun segment has a long, proven track record, and the 18i benefits from that heritage while carrying Weatherby's quality standards.
The inertia system uses the recoil energy of the shot to cycle the bolt rather than redirecting propellant gas into the action. Because no powder residue gets pushed back into the mechanism, the gun stays significantly cleaner between cleanings. Most hunters find that inertia guns require less frequent deep cleaning than gas guns, which is a real advantage in multi-day hunting scenarios.
| UPC | 747115436668 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ISY1228SMG |
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