Nordic Components MXT Modular 12 Gauge Magazine Tube Extension Assembly - Matte Finish

The Nordic Components MXT Modular 12 Gauge Magazine Tube Extension Assembly is a drop-in capacity upgrade for 12-gauge shotguns. Built from 6061 aluminum, this matte-finish extension tube lets you add 2 to 9 extra rounds depending on which capacity kit you choose—perfect for hunters, sport shooters, and competition shotgunners who want more shells on tap without a complete mag system overhaul. The MXT system ships with the tube, matched-length spring, and end cap; you'll just need to source the correct extension tube nut for your specific shotgun model (sold separately).

What sets the MXT apart is its engineering for real-world use. A relief groove machined into the tube (on +2 through +9 extensions) eliminates barrel clamp creep, so the extension stays put after you break down your gun for cleaning. That groove is intentionally off-center, too—flip the tube and you can adjust fit to account for minor variations in mounting. If you're running a Benelli M1 or M2, Nordic offers dedicated "B" models engineered for flush fit: +3 capacity on 18.5" barrels, +5 on 21" barrels.

The matte anodized finish resists glare and blends with tactical and field setups alike. Assembly is straightforward: tube, spring, cap, and nut—no gunsmithing required. Just verify you have the right nut for your shotgun before ordering.

Key Features

• Extends magazine capacity by 2 to 9 rounds (capacity varies by kit selection)
• Machined 6061 aluminum with matte anodized finish for durability and low glare
• Relief groove (on +2 to +9 extensions) prevents barrel clamp slippage and ensures consistent placement
• Reversible design: groove positioning allows fit adjustment by flipping the tube
• Includes tube, matched spring, and end cap; extension nut purchased separately
• Dedicated Benelli M1/M2 flush-fit models available

Specifications

Frequently Asked Questions

Do I need anything else to install this extension tube?

Yes. The MXT extension kit includes the tube, spring, and end cap, but you'll need to purchase the correct extension tube nut separately—it's shotgun-specific, so verify compatibility with your model before ordering.

Will this fit my Benelli shotgun?

Nordic Components makes dedicated "B" models for Benelli M1 and M2 shotguns, engineered for flush fit. The +3B is designed for 18.5" barrels, and the +5B for 21" barrels. Standard MXT extensions are available for other 12-gauge shotguns; confirm your gun model matches the extension nut you select.

What capacity increase should I choose?

The MXT system comes in several capacity kits, ranging from +2 to +9 rounds. Verify your shotgun's compatibility and any legal restrictions in your area before ordering a specific capacity.

How do I adjust the fit if it's not perfectly flush?

The relief groove is positioned off-center, so you can reverse the tube to adjust fit and account for minor mounting variations. This reversible design helps ensure consistent placement after disassembly and cleaning.