Put a propane torch on the material that is left on the barrel lug for a few minutes and see if it melts. That will tell you if it is soft solder or brazing or not.
One time I tried to heat up the lug of an old junk set of original barrels to see if I could get the brazing to separate with mapp gas. No go. And I put a lot of heat into it. So that is why I am amazed that this would have let go if they are in fact brazed.
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B. Dudley
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