The picture makes it look thinner than it is, but regardless you are right, it is much thinner than the stock front blade. I had the suppressor sights, but I've held a few with stock sights and the front sight fills the gap almost entirely, and this isn't even close to that. When I had these installed, they were dead on out of the box. If you like a wider front blade you will need to adjust, but keep in mind, you can order a wider front blade.
I prefer a wider front blade, I didn't know it until I got these, but I'll make these work just find. You tend to shoot a little left or right at first, with so much light on either side of the front blade, but when you do what your suppose too they are impressive.