The WGA West is throwing down the hammer, or at least attempting to, with its staff union. After 71 days on strike , WGSU members were notified that they have received their final offer on a first contract from management, the guild said in an email to writers on Tuesday. “It has been apparent for some time that the Guild and PNWSU/WGSU have been at impasse in bargaining a first staff union contract. Today the Guild made clear to the staff union that the current Guild proposal—sent on April 8—is its final offer,” WGA West leaders wrote in the memo. The proposal on the table “comes after extensive efforts to reach agreement over 21 bargaining sessions, including 2 full sessions during the staff strike, as well as additional conversations with members of their negotiating committee,” the memo continued.…