After three trips to range, it is working great. - Burris FastFire II Reflex Red Dot Sight, 4 MOA Reticle, Black, 300233

Good size sight, but does take getting use to finding dot when first drawing weapon. Easy to adjust windage and elevation with provided tools. Maintains zero after using sight to rack slide and digesting a 100+ 45 hardball and a clip full of 45 super. Able to make one hole groups off hand at 10 yards with my 60 year old eyes. It has been a long time since I could do that with iron sights.