A couple other thoughts come to mind...
. o O ( I dunno about others here, but if I'm going to give myself a handle like that, I'm damned sure not going to put up a how-to video about putting an upper together where I leave parts out, don't use all the right tools, and at LEAST edit out the "ruh-roh" moments... )
. o O ( OPERATOR headspace and timing issue... )
. o O ( I guess if "common sense" was really as common as people think it is, more people would actually have some of it... )
Brother cormorantslayer, I wanted to thank you again, publicly, for the parts and advice you hooked me up with for my lower build. I really like the crispness of the trigger!