Nordic Components +4 MXT Extension Kit – 12 Gauge Mossberg 500/590 Series

The Nordic Components +4 MXT Extension Kit adds four rounds of 12-gauge capacity to Mossberg 500 and 590 series shotguns. This kit extends your magazine tube without replacing the entire assembly, maintaining your factory tube while providing quick-access extra capacity for home defense, competition, or tactical applications. The MXT system is designed to work with factory magazine springs and followers.

Machined from aluminum with a durable black finish, the extension integrates cleanly with Mossberg aesthetics. Installation requires removal of the barrel and magazine cap to slide the extension over the existing tube. A magazine tube nut is required to secure the extension (sold separately, not included in this kit). The extension includes a barrel clamp to stabilize the assembly and prevent binding during cycling.

• Part Type: Magazine Extension Kit
• Compatible Firearms: Mossberg 500/590 series 12 gauge
• Capacity: +4 rounds
• Material: Aluminum
• Finish: Black
• Installation: Drop-in with basic tools (magazine tube nut required, not included)
• Includes: Extension tube, barrel clamp, spring, installation hardware