We used to do 1 of these a month for a quality gunmaker in Scotland.
The parts were all cnc, wire cut etc but still had to be drilled, tapped, fitted down, relieved, shaped, hardened and polished up for an in the white supply. Made main springs as normal, these are easy for me but usually do the V springs as they look better and are stronger than wire cut.
Theres only so far you can go with cnc wire cut etc and only as good as the gunmaker behind the keyboard.
Material has to be left on in most areas to fit but certain things like the trigger blades came just as a shape. It would have been far easier to file in the trigger shape after fitting in to the slots, since you cant hold it. Then to top that after fitting what came file the blade shaping by feel, was on hands and knees.
Worst bits are the trigger guards, came just as a flat shape. Thread first then fit, no gaps wedged in and screwed down, then file internally and externally- Iy just flexes and vibrates no where to brace or hold. Better with a casting.
Mind you didnt care for the safe arrangement.
Shapings the thing and had to make it look like it wasnt machine made.

Thats a weeks work dont look much. Just used to look upon it as a job to do.