Larry,
With all due respect, you are wrong on that one.
Here is a quote found in a google book. (and there were quite a few...)
"d'une plaque de metal prealablemcnt mandrinee de facon a former un cylindre".
Of course the accent is missing (eliminated by Google)as much as it is on the gun (capital letters normally don't have accents).
Dictionnaries are haphazard on old technical wordings. But this was an active technical word. It is not a Brand. It is an adjective and it is germane to barrel making to boot
So there.
Best regards,
WC-
