You can see the windage and elevation adjustment screws along with the battery cover near the lens. Now some other manufactures have their battery compartment under the sight, meaning you have to remove the entire unit to change it. This is one reason I went with Vortex, plus you can't beat their warranty.
 

This is the hardware that I'll use to attach the adapter plate. And the two aluminum step-pins are to help locate the red dot sight onto the plate. The piece to the right has a dovetail that matches the iron sight location on the slide, which I'll show you more about soon.
 

I'm removing the rear iron sight using my custom made punch. If you're wondering why I didn't use this bench block on my other gun is because I forgot it had a slot large enough to accommodate my slide. Yeah I know...a mind is a terrible thing to waste...
 

Here you can see the dovetail a little better. This piece slides into the slot (slip fit) and then gets held in place with two screws. The two pins help locate the adapter plate.
 

Those two screws hold the adapter plate to the dovetailed piece and go where the arrows are pointing. Also, the two step pins can go into any of the four corner pockets. And as you can see, I have them at the front. However, after placing the sight on the adapter plate, I changed the location so the two step-pins were both on the longer edge because I found this to locate the sight a little better this way. But really there should be four of those pins in my opinion. I guess you cut corners where you can these days.
 

One drawback having a red dot sight mounted like this is the height. A better solution is having a slide with a cutout made for the sight, eliminating the adapter plate. This would lower your red dot sight by about 1/4" (1/8" for the adapter plate and 1/8" deep pocket in the slide) and it would be located forward of the rear iron sight as well. With the sight located forward of the rear iron sight, you can use both at the same time, called "co-witnessing'.
 

Co-witness means having your red dot and iron sights aligned together. So if your iron sights and your red dot were sighted in, they would co-witness with each other when you line up a shot. If I like this new sight system, I'll probably mill my slide for my red dot or buy a new slide that has the cut-out milled in it.
 

This is what the red dot looks like while it's lined up on that target. However, it doesn't project it down range. All I did was move the camera between this picture and the one above, with the red dot sight active for both shots. But you would think after seeing the picture below that a beam of light is hitting that target.

Now you can why this sight system would appeal to someone with aging eyes. It makes acquiring a target easier than using iron sights. At this point I'm ready to go to the range and sight in my new red dot.