Adamson G-40 12Ga 18.5 Blk Pump Sg

The Adamson G-40 is a rugged 12-gauge pump-action shotgun built for hunters, sport shooters, and home defenders who need a compact, reliable platform they can trust. At 18.5 inches, the barrel strikes a practical balance—short enough to maneuver through brush, vehicles, and tight spaces, yet long enough to pattern shot effectively at typical hunting and defensive distances. The pump action is straightforward and proven: cycle it fast or cycle it smooth, and it runs.

Built around a synthetic stock and forend, the G-40 shrugs off weather and rough handling without fussing. The forend features a Picatinny rail, so you can mount lights, lasers, or other accessories if your hunting or defensive mission calls for them. A fixed cylinder choke keeps the gun versatile—you can shoot buckshot, slugs, or bird loads without swapping tubes. The 3-inch chamber handles both 2.75-inch and 3-inch shells, giving you flexibility in ammunition selection. A manual safety and rubber butt plate round out the practical spec sheet.

Whether you're running a home-defense shotgun, hunting waterfowl or upland birds over broken terrain, or just want a no-nonsense 12-gauge that works, the Adamson G-40 delivers the kind of honest functionality that doesn't require a second mortgage. With a 5+1 capacity, a rifle sight for aiming, and a handling profile that favors close-quarters work, this is a shotgun that earns its place in your safe or truck bed.

Key Features

• 18.5-inch barrel optimized for maneuverability and pattern performance
• Pump-action design—reliable, user-maintainable, fast to operate
• 3-inch chamber accepts both 2.75-inch and 3-inch shotshell ammunition
• Synthetic stock and forend resist weather and abuse
• Picatinny rail on forend for lights, lasers, and tactical accessories
• Fixed cylinder choke suited to buckshot, slugs, and bird loads
• Rifle sight for aimed fire
• Manual safety for positive control
• Rubber butt plate reduces recoil impact
• 5+1 magazine capacity (5 rounds in magazine, 1 in chamber)

Specifications

Frequently Asked Questions

What ammunition does the Adamson G-40 shoot?

The G-40 is chambered in 12 gauge with a 3-inch chamber. It accepts both 2.75-inch and 3-inch shotshells, so you can run standard ammunition or magnum loads depending on your hunting or sport-shooting needs.

Can I add a light or other accessories to this shotgun?

Yes. The forend features a Picatinny rail, which is the industry-standard mounting system for lights, lasers, and other tactical gear. You can customize the G-40 to fit your mission without any gunsmithing.

Is the Adamson G-40 good for home defense?

The 18.5-inch barrel and pump action make it well-suited to home-defense scenarios where maneuverability matters. The 5+1 capacity and manual safety give you control and firepower. That said, shotgun choice for self-defense is a personal decision—choose what you train with and trust.

What choke does it come with?

The G-40 features a fixed cylinder choke, which is the most open constriction and works well across a range of shotshell types—buckshot, slugs, and bird loads—without requiring a choke tube swap.