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I use the Brownells tool in my shop as I tear down amd rebuild uppers every week.
However, one trick you can do to break the tube free is to clamp the whole tube in a bench vise with the upper upside down and then tap on the rear of the upper with a mallet or a short piece of 2x4 if you don't have a soft faced mallet.
A vise will hold the tube much better than a pair of pliers or vise grips.
Once the tube is moving, it will come out easily.
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