Chuck, no CNC used here at all.
Interesting statement.
If one were to review pages 54 through 65 of the book "David McKay Brown" by Donald Dallas one will see several photos of Hugh and Jeff Phillipson's shop with these two gentlemen standing in front of and working with their various CNC equipment (including EDM's for spark erosion maching) that they have been using to machine the slots for quite some time in the actions that Philipson's supply to the trade.
On page 58 of the above referenced book, Donald Dallas speaking of a period of 10 years or so ago states: "He (David Brown) also discussed with the well known component suppliers J.B. Phillipson their need to invest in new CNC machinery and soon after this they (Phillipson's) invested in a spark eroder and a wire cutter, Jeff and Hugh Phillipson were aware that not enough work for their firm was being generated by conventional machining and that they had to move forward. David guaranteed Phillipson work to help justify their purchase of a new Chameil machine."
If an action forging was purchased from Philipson's in the last 10 years, I suspect that it had to have some "CNC" machining work done to it prior to it leaving their shop.
Of course, the reknown gunmaker "Mr. Pugwash" (post above) knows this better than me.
Bv