Factory or Hilljack Hack?

DoneNOut

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I picked this up used. In the bolt recess is this rubber deal. I imagine it's purpose is as a soft buffer/bumper for the bolt handle to hit softer?
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It was done to eliminate bolt hop caused by the bolt handle cut-out being too deep. The cut-out being too deep causes the bolt lugs to go past center
(12 & 6 o'clock) when the bolt is closed which in turn causes the bolt handle to raise when the trigger is pulled.
 
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