You were actually correct, I was suggesting that forward of the ejection port would be a more ideal location.
DefaultMP3 beat me to it.
Big NO-GO on that.
I've been shooting pistol mounted RDS for a few years now on a few different guns. I can't imagine how moving the dot that far forward would be better in any way. In fact, I think it would make it worse, as the farther from your wrist, the more pronounced movements would be, possibly making it more difficult to pick up the dot.
So for years with 1911s we were taught to "front sight" everything. How would a center location RDS be any more difficult to pick up than a front blade sight?
Not arguing with anyone, just thinking out loud as a though experiment. Also full disclosure, I have only shot a handful of RDS sight handguns a few times. Obviously changes presentation a bit and it was slightly more problematic than I imagined it would be.
Worked better in what way? The sliding scale of how close/far the RDS is to your eye is a balancing act; the closer the optic is to your eye, the easier time you have to pick up the dot and maintain that sight picture, but the sight physically obscures the picture downrange.
Because the front sight blade is visible the moment it physically enters your field of view. The dot is not visible for the majority of the time during the draw until you are able line up that very small FOV in which the dot is visible through the optic. The closer the optic is to your eye, the larger the FOV through the optic, the faster you can pick up on the dot and start aiming with it. On the flip side, there is no apparent advantage to moving the optic up front, given that the optics and handgun itself are small enough that the issues with peripheral vision isn't noticeable. Throw in the engineering challenges with dealing with the barrel up front, along with holster issues, and there's no reason to mount it up front with most modern handgun designs where you're having the optic sit on a reciprocating slide.
If someone figures out how to merge the rough layout of a Leupold Delta Point Micro and advancements(even amaller) on the Holosun SCS electronics and power then it should be doable without too freaky of a holster sight channel. I wouldn't be surprised if some pistol and dot manufacturers working together could pull it off now.