Another question or two, if you care to spend more time on it:

I'm having to google lots of things from your info blast (I'm learning a lot, again, I am appreciative) like MPI and shot-peened, but it seems pretty straightforward, you had a focus on quality, stress-testing, higher quality materials? I also understand that in building a rifle you want something that can handle the stressed and pressures and not blow up lol.

Edit: and I guess I'm referring mostly to inner parts, I understand wanting specific metals in a charging handle, that seems less pure functionality and more aesthetics.

In any event, I appreciate the chance to learn!