I'm wondering about this too and glad you mentioned "crush fit", policeluger. I have a receiver and a barrel and can screw the barrel in hand tight to where there is no gap between the mating surfaces of both (can't get even a strand of hair between them). From that point to get the front sight up all the way the barrel must turn another 1/8th inch (about the width of the extractor cut in the receiver).
You sure have to know what you're doing as it must take a lot of force. Not something I would do, I'd break it for sure!
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