Almost looks like it was a 223 bolt that has been opened up. I dont see any part of the extractor groove.
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The bolt he has problems with is the 2nd set of pics he posted.The extractor lip and rivet are clearly visible in the pictures...rivet is at 1:30 and the extractor lip at 5:00.
Ahhh....my mistake. Sorry. -AlThe bolt he has problems with is the 2nd set of pics he posted.