There are advantages to both systems (Hand or CNC)
The advantage to building a rifle with a Lathe Is mostly in the hands of the Smith. If he has the skills and a good Lathe, he should be able to do a great job because he can adjust to small differences in parts to get the best fit.
CNC machines are very predictable if they are Programed correctly and accurately (Trash in Trash out). The best example that is not the CNC process fault is because factory rifle are all CNC machined and we all know how inconsistent they are from rifle to rifle. The problem is normally, Programming, tooling (Not changed often and only when the work goes out of specification),Quality control and acceptance, The advantage goes to the CNC process if everything is done right when multiple parts are required and consistency is needed.
A good craftsman can match or exceed the quality of CNC when one item is need. If you couple a craftsman and a CNC process the combination it hard to beat.
There are a lot of variables and both systems have there strong points and week points.
I have seen some amazing accuracy come from a master Gun smith and a old Lathe and I have also seen some lousy Quality and accuracy come from a so so gunsmith and a great lathe.
The machine does not make the man do great work, The man makes the machine do good work.
Just My Opinion
J E CUSTOM