Its on a .300 Blackout Ar right now. No issues so far, but less than 200 rounds thru it. I think it has the 2 MOA dot also, which is nice, a lot of the red dot sights have really huge dots. There are plenty of other reviews online, and I know 2 other guys who have one with no issues also. Texas company, supposedly real good customer service if you have any issues (I have never needed it).