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Doesn't take much if something is in the chamber. There is very little clearance between the chamber wall and the case. anything in there will prevent the case from fully chambering, which prevents the bolt from rotating and locking. Not unique to the AR, I bet your bolt gun won't chamber so easy if you stuck a peice of cardboard in the chamber first
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Thats what supprized me. It was in the barrel extension..where the locking lugs turn. Not the chamber....Theres a gap between lugs and it still jammed up, twice even after remedial and immediate action!
P.S. about the bumpfirerer comment...point was...It was a day at the range to just blast away some cheap aguila .223 not a breath controll smooth steady pressure kind of day :P