Great choice for any flat top ar - Troy Dioptic Apeture DOA Top Mounted Deployable Iron Sight

First off, every single Troy Ind product I own is a solid built, functional piece. This Diopter Rear sight is no different. Adjusts with precision, it's built like a tank, and fits very secure on my rail. I do like the largr 0-200yd sight aperture with the diopter markings, but if I'm 100% honest I have to say the 300-600yd aperture is too dark for me and lacks any real functionality. I'm fairness, it is installed on a 10.5 inch AR pistol which cuts down the sight radius enough to make it unusable, so it isn't the products fault.