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I have had a couple of those out of TDC and prefer the set screw front sight base if I have to deal with something or was making a custom length barrel. It was usually a custom job to begin with....

Gotcha... The rest of post #3 makes perfect sense to me too. I just get fiddly when it comes to TDC because of the factory fit barrels that came past me with a rear sight adiustment of several...

I never bothered with the science, just use an angle meter. Stripped receiver(Of course) and use the flats, stripped gas cylinder and use the front sight flats. If you're careful it doesn't even...