Weatherby 18I Synthetic Shotgun 12 ga 3″ Chamber 4rd Magazine 28″ Barrel Synthetic Black Stock

The Weatherby 18i Synthetic Shotgun 12 ga 3″ Chamber 4rd Magazine 28″ Barrel Synthetic Black Stock is a field-proven inertia-driven semi-auto built to run hard in the worst weather. If you need a gun that cycles light target loads and heavy magnums without tuning or cleaning fuss, this is your rig.

Manufacturer	Weatherby
Model	18i Synthetic
Material	Synthetic stock and forearm (per manufacturer specs)
Compatibility	12 gauge 2.75″ and 3″ shells
Finish	Matte black synthetic
Weight	~6.8 lbs (per manufacturer specs)
Condition	New

Key Features

• Inertia Recoil System – This system uses zero gas ports or pistons, meaning no fouling buildup. The gun stays cleaner longer and cycles reliably even when you’re running light 1-ounce target loads or heavy 3″ waterfowl shells.
• Elastomer Recoil Pad – Weatherby engineered a soft, temperature-stable elastomer pad that soaks up felt recoil noticeably. After a 100-round dove shoot, your shoulder will thank you.
• Full-Length Ventilated Rib – The 28″ barrel features a full-length ventilated rib that cuts mirage and gives you a crisp sight picture in any lighting. Fast target acquisition matters when the bird flushes.
• Red Ring Safety Release – The red-ring safety button gives you immediate visual and tactile confirmation of the fire position. Under stress or with gloves, you won’t fumble.
• Matte Synthetic Stock – The textured synthetic stock and forearm resist moisture, mud, and ice. No swelling, no cracking, no excuses in the duck blind.

Who It’s For

This shotgun is for the tech-forward hunter or sport shooter who wants a low-maintenance, high-reliability platform. If you’re the type who tweaks gear and appreciates mechanical elegance (zero gas, zero tuning), the 18i fits your mindset. Early adopters of inertia systems already know: less fouling means more shooting, less cleaning.

Pros & Cons

• Pros: Lighter than most gas guns (~6.8 lbs), cycles light target loads without adjustment, inertia system stays clean, synthetic stock shrugs off weather, price under $850 is aggressive for a Weatherby.
• Cons: Inertia systems require a firm shoulder mount to cycle reliably – if you’re a smaller or newer shooter, you might experience short-strokes with extra-light loads. A gas gun may be more forgiving there.

Comparison

Feature	Weatherby 18i Synthetic	Beretta A300 Ultima	Benelli M2 Field
Operating System	Inertia (no gas)	Gas (self-cleaning piston)	Inertia (Inertia-Driven)
Weight	~6.8 lbs	~7.2 lbs	~6.7 lbs
Chamber	3″	3″	3″
Stock Material	Synthetic black	Synthetic black	Synthetic black
Price	$843.11	$999+	$1,199+
Country of Origin	USA/Japan (Weatherby spec)	Italy	Italy

FAQ

Does the Weatherby 18i cycle light 1-ounce target loads reliably?

Yes – the 18i’s inertia system is tuned to handle lighter loads better than most inertia guns. It will cycle 1-ounce target loads consistently as long as you shoulder it firmly. For extra-light 7/8 oz loads, you may experience occasional short-strokes.

Is the 18i synthetic stock durable in cold weather?

Absolutely. The synthetic stock and forearm are impact-resistant and won’t swell or crack in freezing temps. The elastomer recoil pad stays flexible down to sub-zero conditions.

Can I mount a red dot or optic on this shotgun?

The 18i comes with a ventilated rib and a front bead sight. There is no factory Picatinny rail, but aftermarket saddle mounts or drill-and-tap options are available from companies like Burris or Leupold.

Does the 4-round magazine include the chambered round?

No – the 4-round magazine capacity means 4 shells in the tube. With one in the chamber, you have 5 total rounds on board.

How does the Weatherby 18i compare to the Benelli M2?

Both use inertia systems, but the 18i is about $350 less expensive and slightly lighter (~6.8 lbs vs ~6.7 lbs). The M2 has a longer track record in competition, but the 18i offers similar reliability at a lower price point for hunters and sport shooters.

Trust & Delivery

• ✅ Nationwide delivery (all 50 states)
• ✅ Ships 1-2 business days
• ✅ 30-day returns
• ✅ Secure checkout

Last updated: April 2026

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