FYI, you cannot visually look at the tubes and tell the difference!!! I thought I could... traditionally, the Mil-Spec buffer tube is 1.15" in diameter and the commercial one is 1.17" in diameter... but visually, the Mil-Spec one on the end is square where the commercial one is slanted, easy way to visually tell... OR SO I THOUGHT!
I picked up an extra tube at a gunshow a long time ago, it was square on the end so I ordered a new milspec stock from MagPul... it doesn't fit, the tube is 1.17" and COMMERCIAL, even with a square end
So now I have to send it back and get a commercial one!
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