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I have a tool I made to fit the notches in the tube and uses an impact tool. Knowing you don't have that I will suggest that you make up a 50/50 mixture of acetone and ATF and drip a little into the barrel/tube joint for 3 or 4 days. Then warm the barrel with a heat gun till uncomfortably hot, and use a well fitting tube tool held down so that it can't slip. Good chance it will break loose. Whatever you do don't mess up the notches, if you do it's gunsmith time. When you get it out use a good grease on the threads--I use Never-sieze--and don't forget to loosen and retighten the tube at least once a day when using the gun. Good luck. GW
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