Don't think buffing is gonna work on the alloy, and then there's the stock fit (or lack thereof) issue. I dunno...$250 is about all she'd bring and that's being generous, more in the area of $215-$225 in that condition.
I never have had any luck trying to bend back certain metals like what ever motorcycle clutch and brake levers are made from but they were bent more than this. It doesn't appear that the receiver frame may be damaged so you would be trying to find grip frame to make this correct. I don't believe I would risk trying to bend back the grip frame while it was attached to the non-replaceable receiver frame.