"*the chamber is now 100% CNC machined" I doubt this, chambers are going to be reamed not shaped with a boring bar.
*the recoil lug is now made parallel to .0002” I also doubt this, be tough to measure.
Hi, rickt300. No worries.
As Mathman mentioned, machining in this case refers to machine tools to cut shapes/sizes.
Regarding measurement of the recoil lug. There are other ways to measure besides perhaps a cheap plunge type dial indicator or vernier tools you may or may not have used in a high school shop class or work. Just to name a few: Indicator graduations can range from .001 to .00005. Gage blocks for part inspection can have tolerances to .000001. Micrometers can read to .0001. I’m not saying a basic square would be the right tool, but even some 6” solid squares are perpendicular to within .0001.
