Well, for anybody wondering… the stock holosun plate does two things better than the aftermarket DPP Titanium plate. First, the stock plate has four locating lugs that interface with the bottom of the optic. The DPP has two. Second, the stock plate covers the entire bottom of the optic (it overhangs the sides of the slide a tiny bit). The DPP fits the width of the slide and doesn’t cover the entire bottom of the optic. However, the stock plate does have some slight movement when mounted over the RMSc lugs on the slide. The DPP was a press fit, very good fit and finish as well. If the DPP has the extra locating lugs and was wider it would have been a direct replacement if not “better” fitment wise than stock. I had to file down the extractor side screw as well. I took my Shield RMSc and put one of the stock screws in it. Took a digital caliper and used the depth gauge to measure from the bottom of the screw to the bottom of the optic. Locked that in and filed until the same was done on the holosun. The slide lock side screw was able to be installed at full length.