Sounds like your front action screw is hitting the bolt head. Loosen everything up and take out the bolt...then tighten again. Feel in the bolt chamber for the action screw and I bet it's just coming past the receiver threads. At this point you have 2 options. Either lightly grind down the stock bolt a smidge or upgrade to some nice grade 8 hex cap bolts. But you will still have to grind the cap bolt down to the right size...
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