Really great sights on my BCM keymod!

I just ordered these sights and of course Primary arms delivered them fast and as always has the most rocking service ever! The sights are really good so I cannot understand anything negative others might say, they are built well like troys and lock into place tight with two small ball bearings. easy to install. Same screw type like troy. They don't sit up too high but are similar to the troy system height and not lower profile micros. A tad wider on the base but smoothed out. The diamond apertures are actually better when you get them on and sight in, you can match the front to the back diamond perfect and see them well for close in and far shots beyond 600 yards. I have troys, magpul, LWRC and these are just as good as those sights easy. They are tough too and different. Mine are on a BCM 14.5 Key Upper lightweight and a Royal Arms Lower with Geiselle trigger. I don't even use a scope...Love Primary for selling sets. Neato.