Nordic Components
Required 12-gauge adapter nut that joins an MXT extension tube to a Benelli M1/M2/SBE magazine.

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Nordic Components Shotgun Extension Tube Nut, Benelli M1/M2/SBE/SBE2, does not fit Nova/Super Nova, Matte Black, 12ga, NUT-BN-12-00
NUT-BN-12-00 replaces the factory magazine cap and provides the thread interface an MXT extension tube needs on a 12-gauge Benelli M2. Nordic lists the same nut for the M1, SBE 1/2/3, and Breda Auto. The tube kit will not attach without it. M4 and SuperNova hardware is different, so NUT-BR-12-00 is not an M2 substitute.

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Add the Nordic Components MXT Extension Nut for Benelli M2 to your build and see how it enhances your platform.