Some shooters would prefer the RMR to sit lower within the slide, but I feel the MOS height is the perfect balance in providing co-witness when needed and preventing the suppressor-height sights from being too obstructive when not needed. My RMR has still kept its zero and remained rock-solid, but I wouldn’t use the red dot as a slide racking aid unless I absolutely had to, What I don’t have a problem with is the mounting depth. CZ Custom did manage to mill a P-09 slide to accept different optics without the need for mounting plates. Then again, it may be possible that this was the only configuration that made it possible to accommodate different optics. I’m not a Glock engineer, but I do feel as though the MOS design was rushed to market. If you want to use the Trijicon screws, you have to buy a spacer (Amazon link). The Glock screws are flimsy and easy to strip. You only have about 2 threads of engagement when securing the mounting plate to the slide and when securing the optic to the plate, so loctite is critical. The MOS slides had to sacrifice some mounting security in order be adaptable to a variety of optic choices. The MOS mounting system itself is not very robust. Glock Modular Optics System Technical Details Reports of the Sig Sauer P320 RX, a P320 with a factory-installed Sig Romeo Red dot, have been floating around since early 2015, and Cabela’s even had a listing for them on their website for a while, but the release date kept getting pushed back. The Canik TP9 is getting a budget race gun makeover with its slide cut to accept a red dot, which should be available sometime in 2016. From my research, as of the recording of this video, these are currently the only factory model centerfire handguns that can accept a red dot mounted deep within the slide. Before that, Smith & Wesson had M&P models that were factory-cut for red dots, and FN made the FNX Tactical in 45 ACP with cuts for a slide-mounted red dot. Last year, US customers could only get the competition and hunting models with the MOS, but now the 17 and 19 have options for the MOS. Shooters have been doing custom milling to install red dots on their Glock slides for years, but 2015 was the first year that Glock had a factory-produced model with a slide cut to accept a red dot.
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