The screw on breech-nipple is also typical of conversions from flint, and in my experience British Enfield barrels were one piece, it being the replicas that had the added breech-nipple section. I will accept that some of the earliest might have had a screw on section, but when fluid cast steel barrels came in the "snail" was made in one with the tube. NB, breech plugs are a different matter.
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