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When I was watching your video it almost seems like your valve-striker assembly is not functioning properly. Thats where I would start as it seems problematic to me..
I would also check your white Teflon center-er on your bolt carrier to see if it hasn't moved forward. I had the same problem on my rifle when the Teflon moved forward. When I pulled the trigger it would not fire, but when I pulled the charging handle back, It would fire..
Hope that helps in some way..
Cab
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