Nordic Components Mossberg 12 Gauge Shotgun Magazine Extension Tube Barrel Clamp - Aluminum Matte Finish

The Nordic Components Mossberg 12 gauge shotgun magazine extension tube barrel clamp is purpose-built to stabilize extended magazine tubes on shotguns with heavy or overbored barrels and large barrel-to-magazine offsets. If you've upgraded to a magazine extension on a Mossberg 590, 590A1, 835, 935, or 930SPX—or run a Benelli Nova or Supernova—this aluminum clamp bridges the gap between barrel and extension with the kind of rigid support that keeps everything locked down during shooting, handling, and transport. The matte aluminum finish resists corrosion without adding bulk, and the two-piece design clamps securely around your barrel without permanent modification.

Each clamp half is drilled with a centrally-located 10-32 threaded hole, giving you a solid platform to add sling studs, tactical rail sections, QD mounts, or other mission-specific attachments. That flexibility means you're not locked into one configuration—adapt the clamp as your shotgun's role evolves, whether you're setting it up for 3-gun, home defense, or duty work.

Heavy-walled barrels and extended magazines can create alignment challenges and vibration. This clamp solves that by bearing down on the barrel, reducing flex and harmonics that compromise accuracy and handling. Installation is straightforward, and the barrel clamp doesn't interfere with normal field stripping or maintenance.

Key Features

• Aluminum construction with matte finish—lightweight and corrosion-resistant
• Two-piece clamp design for secure barrel-to-extension alignment
• Threaded 10-32 holes on each half accept slings studs, rails, and QD mounts
• Engineered for Mossberg 590/590A1, 835, 935, and 930SPX platforms
• Also compatible with Benelli Nova and Supernova shotguns
• Adds rigidity to magazine extensions on heavy or overbored barrels

Specifications

Frequently Asked Questions

Will this barrel clamp fit my shotgun?

The Nordic Components clamp is designed for Mossberg 590, 590A1, 835, 935, and 930SPX shotguns, as well as Benelli Nova and Supernova models. It's intended for shotguns with heavy or overbored barrels and magazine extensions that sit offset from the barrel.

What can I attach to the threaded holes?

Each clamp half has a 10-32 threaded hole. You can add sling studs, tactical rail sections, QD sling mounts, or other 10-32 compatible accessories to customize the clamp for your setup.

Does this require permanent barrel modification?

No. The barrel clamp is a two-piece design that clamps around your barrel without requiring drilling, tapping, or any permanent alteration to your shotgun.

Why would I need a barrel clamp on my magazine extension?

Shotguns with heavy or overbored barrels and magazine extensions can experience gap and movement between the barrel and tube. The clamp bridges that space and adds rigidity, reducing vibration and flex during shooting and handling.