Solid optic, with just 1 minor gripe. - Holosun HS403R 2 MOA Red Dot Sight

Bought this specifically for the rotating illumination adjustment knob, as I didn't want the rubber buttons that will eventually wear out over time. ...The knob functions well, it isn't "too easy" to rotate, which means accidentally knocking it won't change settings. My only gripe about this optic, is that the knob also houses the battery, which is fine design wise - but what's not fine is that the edge of that battery cover is kinda sharp IMO. So if you don't grip the knob directly, and grasp the battery cover too, it can be very uncomfortable on your finger. It takes some practice to grab it correctly, I just wish that edge was a bit more "dull" & "rounded," because my dainty-fingers use a keyboard & mouse all day, not putting up brick & mortar. Otherwise it's a great optic!