M2 tactical magazine tube extension

[Poydras]

I am considering a magazine tube extension for my M2 tactical. I would like a three or 4 shell extension. What is the best magazine tube extension in your experience or knowledge for this gun. I would want the best quality and reliability. Thank you.

[USA1IRON]

I have installed a Benelli 80155 kit. It is a 4 round extension with every thing you need. Works as it should and holds 7 rounds of 2-3/4”

[truckcop]

If you can find one, the OEM extensions are preferable.  Next on my list would be Nordic Components extension.  If you're flush with cash, go whole-hog and go with a monotube replacement (full length tube, not an extension) by Roth Performance, formerly X-Rail by RCI.