In reply to:

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The differences in the H&H system from most is their use of heated IRONS placed in the barrels, turning the barrels themselves into soldering irons.

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Mac,
I would guess that these days many regulators would use gas torches but surely "back in the good old days" many other quality makers also used the hot iron method of heating, not just H&H?

How did Westley Richards, Webley, Rigby etc heat their barrels during regulation on guns built in the pre war era?

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