Mike, thanks for posting that.... The thing still being questioned by some is the wall thickness of the main body of the tube, ie what is it at the back, not at the front where it is threaded.... If you get a chance, I would appreciate it if you could photograph the tube you still have, remeasure it at the back (ID, OD, wall thickness), and document it.... Measuring the ID of the threaded section, and photographing it as well, would help, of course.... If you have no way to post those photos, you can send them to me at airgunbob at gmail dot com and I will host them here via my Photobucket account for all to see.... This mystery, IMO, is still that.... and we need to try and get to the bottom of it.... Bob
Did anyone notice that BOTH the 2260MB tubes that Bill posted in his photo above were roll-stamped on the LEFT?.... Both were stamped 2260MB, the smooth (dark) one was within spec, the one with the scratchey, ground finish (appears lighter because it reflects the light differently)