Frank Gore's frustration has grown to the point that th...

Frank Gore's frustration has grown to the point that those around him say they've never seen the 49ers' running back as frustrated as he's been over the past couple weeks.

One team source said Gore has uncharacteristically "snapped" at some of the team's assistant coaches as his concern has grown over not receiving a contract extension. Gore is signed through the upcoming season at approximately $5 million.

Gore is not pleased he has played more in the exhibition season than in previous years, which puts him more at risk for injury while he awaits a new contract, the source said. Gore said this week he wants a contract extension prior to the start of the regular season so he can concentrate solely on playing football.

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