The Weatherby 18i Waterfowler is a 12-gauge semi-auto shotgun with an inertia-driven piston action, chambered for 3.5-inch shells. The 28-inch chrome-lined barrel pairs with a composite frame and aluminum receiver finished in First Lite Specter Camo. At 7 lbs and 49.25 inches overall, it carries easily through a long morning in the marsh. 
 

Key Specifications 

• Model: 18i Waterfowler 
• Caliber/Gauge: 12 Gauge 
• Action: Inertia-driven semi-auto 
• Barrel Length: 28 inches 
• Capacity: 4 rounds (3 with plug) 
• Weight: 7 lbs. 
• Overall Length: 49.25 inches 
• Chamber Length: 3.5 inches (Magnum capable) 
• Drop at Comb: Adjustable from 1.9" to 2.5" 
• Drop at Heel: 1.5" 
• Choke System: Includes IC, IM, M, I, F chokes 
• Sights: LPA Fiber Optic front sight 
• Finish Material/Color: First Lite Specter Camo (Composite Frame; Aluminum Receiver) 
   

Detailed Features 

The inertia-driven action keeps recoil manageable and cycles quickly between shots. Chrome lining on the barrel makes cleanup after wet-weather use less of a chore. Length of pull is approximately 14.33 inches, and the comb is adjustable between 1.9 and 2.5 inches of drop, which gives shooters of different builds a usable fit. Five chokes, IC through Full, cover the range from decoying ducks to upland birds. 
 

Target Audience 

The 18i Waterfowler is aimed at duck and goose hunters who want a light semi-auto that can handle magnum loads. The adjustable comb and multi-choke system also make it adaptable enough for upland work or informal clay shooting. 
 

Usage Scenarios 

The 3.5-inch chamber and First Lite camo make the most sense in a blind or wading a marsh, where concealment and payload matter. The chrome-lined barrel and inertia action handle wet conditions better than gas-operated systems that collect fouling. It also adapts reasonably well to clay sports where follow-up shots matter.

Waterfowl hunters who own the Weatherby 18i tend to like it, particularly the inertia action and its reliability in the field. Smooth cycling and quick follow-up shots are the most common positives, which is exactly what you want when birds are working fast.

The camo finish and light weight also get mentioned regularly. Seven pounds is on the lighter side for a 3.5-inch 12-gauge, so the carry is genuinely easier compared to heavier options.

Recoil is a recurring discussion point. Most owners find the 18i manageable, but some note it's a bit snappier than comparable gas-operated guns, particularly with heavy loads. Durability questions come up occasionally, not widespread complaints, but some users mention finish wear or component issues after heavy use.

Overall the sentiment is positive, and the gun has a following among waterfowlers who prioritize reliability over a softer-shooting gas gun. Individual experiences do vary, as with any semi-auto shotgun running a range of load strengths.