So... the barrel of an AR (at least my AR) has a shoulder about 9/32nd of an inch from the center of the gas port. and that's the same distance with the sight block port. Maybe when tightening everything down the sight block crept forward a bit and that was why it only shooting semi.
I reassembled, paying close attention I didn't knock the sight any, and wanted to hit Hap Baker with Saucy Trollop, to test. You gotta get there more than 10 minutes early if you want a lane anywhere. Maybe next weekend.
If it doesn't cycle then, then I will have to go back to the drawing board.
Oof - What a week. Time to kick back.
33 minutes ago