The Weatherby 18i Deluxe is a 12-gauge semi-automatic shotgun with an inertia operating system, a high-grade walnut stock, and a matte nickel receiver. It chambers both 2¾-inch and 3-inch shells and ships with five chokes covering IC, IM, M, I, and F. 
 

Key Specifications 

• Model Name: 18i Deluxe 
• Caliber/Gauge: 12 Gauge 
• Action: Semi-Auto 
• Barrel Length: 28 inches 
• Chamber: 3 inches (also accepts 2¾ inch shells) 
• Capacity: 4+1 rounds (2¾ inch shells) 
• Overall Length: 49.25 inches 
• Weight: 7 lbs 
• Sights: Fiber Optic Front 
• Stock Material: High-grade Walnut 
• Receiver Finish: Matte Nickel 
• Safety Type: Crossbolt safety 
   

Detailed Features 

The inertia system uses the recoil energy from each round to cycle the action, which keeps the internal parts count low and the system reliable in wet or dirty conditions. The vent rib barrel provides a consistent sighting plane. Five included chokes (IC, IM, M, I, F) cover upland and waterfowl distances. The fiber optic front sight improves target acquisition in early morning light. The fixed walnut stock with matte nickel receiver gives the gun a traditional aesthetic that distinguishes it from synthetic-stocked alternatives in the same segment. 
 

Usage 

At 7 lbs with a 28-inch barrel it handles well for upland and field use. The inertia system is light on maintenance compared to gas designs. The walnut stock is the primary visual differentiator. It suits hunters who want a traditional-looking semi-auto rather than a synthetic/camo platform.

Owners consistently highlight two things about the 18i Deluxe: the appearance and the reliability. The walnut and matte nickel combination stands out positively compared to synthetic alternatives, and the inertia action earns consistent marks for smooth, dependable cycling.

Minimal felt recoil relative to the gun's weight is a recurring positive. Most owners report the action running cleanly across a range of loads without adjustment.

Price is the main critical theme. The 18i Deluxe sits above mid-range semi-autos, and buyers weigh the walnut stock and overall fit/finish against the cost difference. Most who purchase land on the positive side, but it's a considered decision rather than an impulse buy in this segment.