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Nordic Components MXT Extension Tube Kits are a universal fit solution for extending the capacity for a variety of 12ga shotguns. These MXT Extension kits include: the tube in the additional capacity you select, the correct length spring for the tube, and an end cap. Simply select the proper capacity MXT Extension kit you need then purchase the correct Nordic Components Shotgun Extension Tube Nut that fits your shotgun (sold separately).

"B, Models are engineered for flush fit on Benelli M1/M2 (+3B on 18.5" barrel; +5B on 21" barrel)


Anodized 6061 aluminum for strength and weight

Features relief groove to eliminate barrel clamp travel and ensure repeatable placement after disassembly (+2 through +9 extensions only)

Relief groove located off-center to allow location adjustment by reversing the tube

Machined with matching thread pitch on both ends to allow reversing the tube


Click this link to find the attachment nut for your firearm application: Extension Tube Nut