Does exactly what it is supposed to - Nordic Components MXT Extension Kit, 12ga

This extension doesn't change the world, or cure cancer, but it will give you another two rounds in the tube reliably. The stock tube and nut are easy to remove, and the Nordic Components tube comes with a spring that needs to be trimmed to the appropriate length (~12" longer than the total length of the magazine tube) Along with the Nordic Components extension tube nut it fits securely and functions just as you would expect. I now have Nordic Components parts on three of my shotguns, and I am happy with every part I have that was manufactured by them.