I used the Mil-Spec kit a couple weeks ago and found the tube larger than spec. The Magpul stock went on really hard and would not slide without a fight. It has since been replaced.
"You and I are told we must choose between a left or right, but I suggest there is no such thing as a left or right. There is only an up or down. Up to man's age-old dream -- the maximum of individual freedom consistent with order -- or down to the ant heap of totalitarianism. Regardless of their sincerity, their humanitarian motives, those who would sacrifice freedom for security have embarked on this downward path." -- Ronald Reagan