With the Glock MOS system, I've seen people say that it's more of a jack of all trades, and while you can mount an RMR to it, it won't be as secure as milling a slide specificially for an RMR. I wonder how the optics ready P-10C compares to milling a slide for the RMR. I would assume that having it milled is better, but the real question is how much better?