Nordic MXT 12ga Mag Extension Tube Coupler

From Nordic:

MXT Coupler with included MXT Extension.

Expand the modular capacity of your Nordic Components MXT Extension! This clever device couples two of our MXT Extension tubes together for added capacity. Create your own combination (+5 and +3 for a total of +8, +7 and +2 for a total of +9, etc.).

When using an extension tube that is longer than the barrel, it can be hard to find a gun case that can accommodate it. Using this coupler will make it easier for you. It eliminates the need to disassemble your barrel clamp and Barrel nut from the gun when transporting your shotgun to and from the range. This is a very handy item for the 3-gun and tactical shotgun competitor. Choose the added capacity you want.

NOTE: While it is OK to have your extension protrude past the muzzle, you may experience a carbon build-up, scoring or discoloring of the extension, especially when using a ported choke tube. Cosmetic damage of this sort is not a warranty issue.