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I have no experience with this rifle, but as a pipefitter I know that after you heat up steel it expands. But when it cools it contracts to a tighter state than it was originally before you applied heat. So it may actually be tighter now that it's cooled. I'm not sure if a blow dryer is quite enough heat to apply to this situation.
Try to loosen it while the heat is still applied. If there is no hex screw, then it really should come off with a wrench. It must be loc-tite'd in. Wrap the tube with rags to avoid teeth marks. And try to hold back with a second wrench or a vice.
Good luck!
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