Very cool. Thanks for posting that.. I forgot to mention that the C4 sights In the op fit right under my Burris AR556 4.5-14x42 scope I use. No problemmo... It looks like the sights you show here do the same thing. I think what sold me on the Ultradyne sights was the front aperature style sight. I started using those on my 22 target rifles a while back and man those things make life simpler..