Food for thought/counter point:
I watched a colt technician test fire a crate full of officers that were returned for feeding issues. All but 2 ran fine with the little old lady running the gun.
I looked at a few Warriors that had the mag well broached at the wrong angle. That was neat.
I saw a bunch of Springers come in that were machined with dull and broken tools. That was ugly beyond words.
I've seen 7 glocks now that had a similar problem as the one I posted in another thread.
So far, and remember I'm not a ninja/armorer, I've only seen 2 types of handgun that were consistently "right."
P30s and P35s.
YMMV, FWIW
I'm low on caffeine, so might be some not to well thought out points.