Yup, it's "glued" in place by carbon. There's no delicate way to get it out, unless you have one of those gas tube tools from Brownells. You'll have to figure out how to grab (with pliers, Vise-Grips) the tube, wiggling and pulling rearward. Eventually it will come out. You may damage the tube, but the only reason to remove it is to replace it, right?
Regards,
Walt
—who's written a lavishly illustrated book on this as well as everything else involved in the AR-15/M16's assembly.
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Author, NEW! The M1911 Complete Owner's Guide
The M14 and M1 Garand Complete Assembly Guides
The M1 Garand Complete Assembly Guide
The AR-15 Complete Assembly and (New 4th Edition) Owner's Guides
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