New build, jammed round in chamber - need help

[grayfox]

The picture in the thread you referred to showed the bolt going over the head of the cartridge case. This issue is usually caused by insufficient gas or a bad mag where the cartridge isn’t raised fast enough to be pushed forward by the closing BCG. I suspect you don’t have the gas block opened enough, with insufficient gas the bolt carrier doesn’t go back far enough to get the required momentum from the buffer spring to force a round into the chamber. On a tight new build a cartridge can be difficult to extract.
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One followup comment/question, Vascar since too little gas could be part of this type of problem doesn't it suggest that for an adjustable gas block, you might want to start full open and close down a click at a time as you shoot instead of fully closed to start with? That's one reason why I started fully open with mine, although I don't have lots of experience with AGBs... just have 2 of them. Thanks.