you can peen it your self, I had the same problem. I also put a dab of blue loctite under the bass. I think someone at one point tried to drift the rear sight on mine the wrong way and loosened up the dove tail. It was a bit loose centered in the dove tail. Carefull restaking and the loctite has held. I was actually surprised how well my carbine shot at 100 yards. My carbine was never 0'd after rebuild and the front sight is to tall. I need to set it on 250 mark to hit the black.