I compare after-market barrels to after-market shocks, ..
My late father designed guns and vehicles. He bought the barrels and did not talk about them,,, and so through my own ignorance I can pretend I know all I need to about barrels. But shocks... he had a bunch of suspension patents that I could understand as long as he was talking. I think I could hand wave about parabolic taper for recoil shocks, but I have some idea of the magnitude of my ignorance about shock absorbers.
But barrels, I am fat dumb and happy with ordering Shilen select match stainless barrels every year.
I get small groups and the teacher should put a star on my range report.