The MXT extension nut allows for installation of a Nordic Components MXT 12ga shotgun extension tube kit. The nut replaces the factory magazine cap, and is required for installation of the extension tube kit.

For increasing the capacity on the Mossberg 930 JM Pro, please visit the JM Pro section of the FAQ page or the MXT Fit Guide.

The MB-model nut is compatible with the following 12 gauge shotguns:

• Mossberg 590/590A1
• Mossberg 835
• Mossberg 930
• Mossberg 940
• Mossberg 935
• Tristar TEC-12 (requires spacer between barrel lug and nut)

This nut is not compatible with the Mossberg 500 or 535, or the Maverick 88.

Any magazine dimples or spring retaining devices will need to be smoothed or removed to allow proper function.

Note: This nut will also be compatible with other shotguns utilizing the same factory magazine thread pattern, but may require modification/fabrication for proper installation. Nordic Components does not have specific information regarding compatibility beyond the models listed in this description.