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This part replaces the adjustable "blade" in the rear sight of your PPQ. It is shorter than the stock sight, allowing you to bring your groups down. I found the stock sight was too high, even when adjusted all the way down. It is also wider, reducing the amount of play and "seesaw" effect. There is a recessed paint guide if you wish to paint. I found the blackout sight hard to see against dark targets.
You will likely need to do some sanding/filing for this to fit well.