Perfectly good - Midwest Industries MICBUS Top Mounted Fixed Iron Sight

I would compare this to the DD 1.5 rear sight, which I've used in the past and is a great sight. The adjustment wheel on the DD is a little cleaner and easier to turn, but the aperture on the MI feels stiff (which is good in my book) and very straight. I've also used a Troy fixed which was very rugged and had nice apertures but they flipped a little too easy for my liking. If you want to run irons only, you can't go wrong with this one, the DD, Troy, or Colt carry handle, all great, but this one has a good price for what you're getting. No issues when zeroing and it seems rock-solid. Best described as sacrificing a little of the polish and elegance of the DD without sacrificing any durability or function.