If you’re looking for more capacity, this 12 gauge Fabarms STF/12 extension nut is half the equation, allowing installation of a Nordic Components 12ga shotgun extension tube kit on your 12 gauge Fabarms STF/12 shotgun. The nut is required for installation of the tube kit.
Any magazine dimples or spring retaining devices will need to be smoothed or removed to allow proper function.
Note: This 12 gauge Fabarms extension nut may also be compatible with other shotguns utilizing the same factory magazine thread pattern, but may require modification/fabrication for proper installation. Visit the shotgun extension fit guide for information on other shotgun models.