Nordic Components MXT Magazine Extension Kit +3 - Enhanced Capacity for Tactical and Competitive Shooting

The Nordic Components MXT Magazine Extension Kit +3 is a no-frills capacity boost for 12-gauge shotgunners who need more rounds on tap. Whether you're running 3-gun competitions, tactical training, or just want deeper magazine wells for hunting, this aluminum extension tube system lets you add three rounds to your shotgun's magazine tube. It's built from 6061 aluminum—lightweight and durable—and comes with everything you need to install it: the extension tube, the correct-length spring, and an end cap. The only thing you'll need to source separately is the attachment nut that matches your specific shotgun model.

Nordic Components engineered these kits with practical details that matter on the line. A relief groove machined into the tube (on +2 through +9 extensions) prevents barrel clamp creep, so your setup stays consistent after you break it down between stages. That same groove is offset, giving you the option to reverse the tube and adjust its position if you need fine-tuning—useful when you're dial-in your gun's handling or accommodating different shooting positions. The tube is machined with matching threads on both ends, so reversing it is straightforward.

If you're running a Benelli M1 or M2, Nordic Components makes flush-fit versions: the +3B for 18.5" barrels and +5B for 21" barrels, designed to keep the extension aesthetic and functional without adding bulk. For other shotgun platforms, measure your barrel and select your capacity, then grab the correct extension tube nut for your gun's model. It's a direct, honest upgrade for shooters who want more ammo capacity without complications.

Key Features

• Increases magazine tube capacity by 3 rounds
• 6061 aluminum construction for strength and light weight
• Includes extension tube, spring, and end cap—nut sold separately
• Relief groove prevents barrel clamp travel and shift after disassembly
• Offset relief groove allows reversible tube placement for position adjustment
• Machined with matching thread pitch on both ends for flexibility
• Benelli M1/M2 flush-fit models available (check barrel length compatibility)

Specifications

Frequently Asked Questions

What shotgun models will this extension fit?

The MXT +3 is universal fit for 12-gauge shotguns, but you must purchase the correct Nordic Components Extension Tube Nut that matches your specific shotgun model (sold separately). If you own a Benelli M1 or M2, Nordic Components offers Benelli-specific flush-fit versions; choose +3B for 18.5" barrels or +5B for 21" barrels.

What's included in the kit, and what do I need to buy separately?

The kit includes the extension tube, the correctly sized spring for that tube, and an end cap. You'll need to purchase the appropriate Extension Tube Nut separately—it must match your shotgun's model and threads.

Can I adjust where the extension sits on my shotgun?

Yes. The relief groove is machined off-center, so you can reverse the tube to adjust its position. The tube also has matching thread pitch on both ends, making reversal straightforward. This flexibility helps you fine-tune fit and handling for your shooting style or gun setup.

Why does this extension include a relief groove?

The relief groove prevents the barrel clamp from creeping or shifting after you take your shotgun apart for cleaning or maintenance. It ensures your setup stays consistent and repeatable between range sessions or competition stages.