This way it gets fixed right and I will not boggier it up by trying to do it my self.
Better safe than wanked.
They'll fit a new sight to it. Chances are, the slide is at the max of tolerance while the sight is at it's minimum tolerance. They'll pull a sight at the larger end of the acceptable tolerance range and send it back. Don't sweat the turn around... you'll have it back in 2 weeks or less.