2-1 Assemble the Rifle

  
  

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 6.  Drop in the firing pin.
 7.  Put the firing pin retaining pin in.
 8.  Pull the bolt back.
 9.  Place the charging handle.
 10.  Slide the bolt carrier into the upper receiver.
 11.  Push the charging handle and bolt carrier together.

Drop in the firing pin to seat it.