Description
The Weatherby 18i Synthetic Shotgun 12 ga. 28 in. Black Synthetic 3.5 in. RH is a semi-auto built for shooters who demand reliability under heavy use. Its inertia-driven action cycles cleanly with 12-gauge loads from 2.75-inch target shells up to 3.5-inch magnums, making it a versatile choice for dove fields, duck blinds, and turkey woods alike.
| Manufacturer | Weatherby |
|---|---|
| Model | 18i Synthetic |
| Gauge | 12 ga. |
| Barrel Length | 28 in. |
| Material | Billet aluminum receiver, synthetic stock |
| Finish | Black synthetic |
| Weight | Approx. 7.2 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Inertia-Driven Action – Why it matters: This system uses the gun’s recoil to cycle the next round, reducing felt recoil and keeping the action clean even after hundreds of rounds in dusty conditions.
- Precision-Machined Billet Aluminum Receiver – Why it matters: A single-piece receiver eliminates weak points, ensuring consistent lock-up and long-term durability under high-volume shooting.
- Soft-Touch Cheek Rest – Why it matters: The polymer stock has a soft-touch area on the cheek piece that prevents slippage and improves comfort during long hunts or clay sessions.
- Aggressive Textured Grips – Why it matters: The palm swell and foregrip feature aggressive texture, giving you a secure hold in wet or gloved hands.
- 3.5-Inch Chamber – Why it matters: This gun handles everything from light target loads to heavy waterfowl magnums, giving you one gun for multiple seasons.
Who It’s For
This shotgun is for the Southern shooter who spends more time in the field than at the range. Whether you’re walking a dove field in September or hunkered down in a duck blind come January, the 18i’s light weight and reliable inertia system keep you shooting all day without fatigue.
Pros & Cons
- Pros: Reliable cycling with a wide range of loads, lightweight (7.2 lbs), soft-touch cheek rest, 3.5-inch chamber for versatility, and a durable synthetic stock that shrugs off weather.
- Cons: The inertia system can be sensitive to very light target loads (under 1 oz.) if not cleaned regularly—something to keep in mind for high-volume clay shooters.
Comparison
| Feature | Weatherby 18i Synthetic | Benelli M2 Field | Stoeger M3000 |
|---|---|---|---|
| Action Type | Inertia | Inertia | Inertia |
| Weight | 7.2 lbs | 6.8 lbs | 7.0 lbs |
| Chamber | 3.5 in. | 3.0 in. | 3.0 in. |
| Stock Material | Black synthetic | Black synthetic | Black synthetic |
| Price | $991.30 | $1,599.99 | $599.99 |
FAQ
What is the difference between the Weatherby 18i and the Weatherby SA-08?
The 18i uses a proven inertia system, while the SA-08 is a gas-operated design. The 18i is lighter, easier to clean, and better for high-volume shooting because it doesn’t vent gas into the action.
Can this shotgun handle steel shot for waterfowl?
Yes, the 18i is factory-rated for steel shot through the 28-inch barrel with a modified choke. Always use chokes marked for steel shot to avoid barrel damage.
Does the Weatherby 18i come with a shim kit for cast and drop adjustments?
Yes, the 18i includes a shim kit that lets you adjust drop and cast to fit your shooting style. Per Weatherby specs, this allows for a custom fit without gunsmithing.
How does the 18i cycle light target loads?
It cycles standard 1-1/8 oz. target loads reliably. With very light 7/8 oz. loads, occasional failures to eject may occur until the gun is broken in (about 100 rounds).
Is the Weatherby 18i made in the USA?
Weatherby shotguns are designed in California and manufactured in Turkey to their specifications. The quality control is consistent with Weatherby’s reputation.
✓ Nationwide delivery (all 50 states) | ✓ Ships 1-2 business days | ✓ 30-day returns | ✓ Secure checkout
Explore more semi-autos in our Semi Auto Shotguns category, or check out all Weatherby Shotguns and 12 Gauge Shotguns.
Last updated: April 2026
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