Posted: 7/4/2025 11:09:16 PM EDT
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Just picked up a Glock 21 Gen 5 MOS and looking to add a red dot. I see there are a few different mounting options but not all optics will fit. It did come with 1 mounting plate (I heard they used to come with 3?) How can you determine what mounting bolt pattern you need for what RMR? Is there one that mounts directly to the slide without the plate? |
when you die, on your deathbed, you will receive total consciousness
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Originally Posted By txgunguy: The "02" plate is what comes with Glock MOS models now. It is for the RMR footprint. That's listed for the midsize guns. 06 is used for RMR on the G21 (per Glock) https://store.glock.us/glock-mos-adapter-plate-06 But a lot of people think OEM plates are trash. A lot of people here recommend the duck lover. I think his anti Holosun attitude is silly and his stuff is pricey, but I'm sure it's probably bulletproof as well  . I've seen it mentioned that his regular G17 MOS RMR plate will work on the G21, it just won't be full width. But check with them to be sure. He's not a paying advertiser, but I can mention him  https://www.forwardcontrolsdesign.com/ Edit, here's info on their G21 MOS fitting info (AKA it fits, but with more details). https://www.forwardcontrolsdesign.com/g20-g21-g22-compatibility.html |
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This guy makes titanium plates which are full width for the G21. Starting at $125, which is wacky. But I don't have a bunch of titanium or milling equipment sitting around, so what the hell do I know? https://eleven71design.com/shop/p/10mm-45-mos |
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Thanks David, OPF-G, RMR works on wider slides since the plate is already wider than the 9mm slides and has an overhang, but flush with wider slides, the front two corners contours are designed for 9mm slides and don't match the wider slides. Attached File BTW we're not anti Holosun, if they were an American company, we'd be all over it. As it stands, we support sights made in the US and allied countries, or by companies based in the US and allied countries. |