KAC1911, I purchases a few ‘DE milled’ P14s, the British drilled a hold through the barrel in front of the receiver, the hole was close to .311” the hole was drilled through the barrel.,
I have purchased pull down powder and cases from different dealers in Houston, TX., KY. and OHIO, I have had the opportunity to purchase receivers that were cut, slides that were cut, normally in short pieces, that included frames. All were referred to as De-milled, then they went from cutting with a saw to using a sheer, the sheer fractures the metal like spider webs.
Then there was welding for parade and practice, many of those rifles have been returned to shooting form.
It would help if you posted a link.
F. Guffey