Designed for the buckmark and it fits great on the buckmark rail too. - Browning Buck Mark Reflex Sight, 3 MOA Dot Reticle

Bought this for the wife's pistol. She can use iron sights but I think she'll be able to shoot faster when she gets used to this sight. I did notice that I had to change the way I looked over the pistol so the dot came into view. Kinda had to point the pistol "down" compared to what I thought. Once I got over this, it works REAL well :) Almost too bright at the highest settings indoors.