The height difference of a direct mill and MOS type of system is negligible. Most iron sight manufacturers have also consolidated with Glock MOS height (looking at Dawson and Ameriglo as the standard), which diminishes the argument of optic co-witness. Sight presentation is also a wash because an evenings worth of drawing will negate that.
Add that the generic milling cut of MOS and others will not fit all sights tightly.
Example front to back the vortex sights are longer than Trijicon, that means the screws are taking some abuse holding the trijicon in place.
If they are milled the sight hits the front and back of the cut so the screws just hold it down.
Mine is very snug. It required me to do some fitting to get the sight on the plate. FCD tells you on their site that you may need to do this. I have a pretty solid background in machining, and can say without actual experience with a milled slide, the FCD plate easily supports an RMR front to back just as good as a milled slide.
Forgot to close this out.
I got a Walther PDP Compact a few weeks ago.
So far I'm really liking it. Got a Tenicore Velo 4 holster for it.
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