I don't know the need is as relevant to rifles, though, since using a rifle is seldom a surprise event. For my context, if I have time to get the rifle I have time to turn the dot to 'good enough'. I've had to adjust a few times on a call, notably when a guy was holding himself hostage deep in a dark garage and I was out in the sun taking cover behind a tree. Handguns may not have that luxury. I'm solely using manuals on handguns right now, because I don't trust any automatic to be right, but it's not exactly the same as carbine use in my world.