I just sold my M1 to buy a M2. I was planning to buy a new M2 but at the last minute I found a slightly used M2 that came with the long mag tube so now I have two. I have a friend who wants it but I do not know what they are worth. It is the tube, Nut, spring, end cap and sling mount. This tube allows 7 rounds in the tube, one ghost loaded and one in the pipe to reduce any confusion about length.
Thanks for your help.