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The bolt is never supposed to go into the buffer tube
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I thought when the bolt is "open", the bolt is sitting mostly in the buffer tube, until the buffer pushes it forward into battery, under power from the buffer spring. I'm at work now, but I'll have to look at the ar when I get home.
I agree the buffer retention pin and spring could be a cause. Is the buffer retention spring the one that falls out when you remove the pistol grip? Maybe removing that is a simpler first step than removing the buffer tube.
Regards.