Yes, a loose castle nut can cause a problem. Your rifle will not self destruct if it loosens. It will malfunction and you’ll look like that guy because your castle nut isn’t staked. Buy a $10 punch and move some metal over and you’ll be fine.
Haven’t watched the Geissele video but I do know this. DD sells a shit ton of barrels and you rarely if ever hear of accuracy or chamber issues. So either he wasn’t talking about DD or somehow through a miracle their barrels have an unbelievably high function rate.
Their bolts have not been known for issues either. I wouldn’t sweat it about the BCG or bolt. Their BCG’s are tested and I’d be surprised if their bolts aren’t as well.
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