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Thread: Glock MOS RDS install thread (What has worked for me)

  1. #1
    Site Supporter NickDrak's Avatar
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    Glock MOS RDS install thread (What has "Worked for me!")

    Figured I'd start a thread to help folks with properly setting up their factory Glock MOS pistols with a Trijicon RMR. This may be of value to MOS shooters who are running other brand RDS like the Leupold DPP, but these suggestions are specific to mounting a Trijicon RMR onto the MOS system....

    I strongly believe that the instructions included with the MOS are lacking in important info which could help MOS user avoid the commonly reported issues with the MOS platform. Glock does not list any specific torque values in the manual, and only specifies "Hand tight ONLY". Considering there is thousands, possibly tens of thousands of MOS Glocks in circulation currently, its safe to say that you're going to get a huge variation in what "Hand tight ONLY" means to everyone out there installing optics on these guns.

    The other issue is that Glock specifies referring to the optic sight manufacturer's suggestions on which screws to use for a RDS mounting on the MOS platform. Thats not gonna work out for everyone because I don't think any specific RDS manufacturer states exactly which screws are required for proper installation of their sight onto the MOS platform. For example, If you buy a Trijicon RMR there are two mounting screws included in the box with the RMR. These are the incorrect screws to use for mounting the RMR on the MOS. They are too long and will cause a impingement issue with the MOS adapter plate and the slide. Trijicon does sell a completely separate sealing plate kit with the proper length screws for mounting an RMR onto the MOS, but its not specified anywhere in the Glock MOS instruction manual or in the Trijicon manual.

    *Don't use Red or Blue Loctite brand thread adhesive. (*Blue isn't strong enough and Red Loctite is too strong and will result in stripped out screw heads)

    *Only use VibraTite brand VC-3 thread sealant.

    *Degrease the threads of the screws before applying the VibraTite VC-3

    *Let the VibraTite VC-3 dry for at least 45mins before installing the screws.

    *Get a torque wrench and install both the adapter plate and the RMR screws with 14-15 INCH lbs of torque. I've use the inexpensive Wheeler Fat Wrench without any issues.

    *Do NOT use the two mounting screws that come included in the box with the Trjicon RMR for mounting on an MOS. Order the proper length screws for your desired RDS. BattleWerx.com sells RDS and MOS adapter plate screws for every RDS combination you can think of. If you are mounting a Trijicon RMR you can just purchase the Trijicon brand AC32064 "RMR Mounting Kit Fort Glock MOS" which includes the proper length screws.

    *I've had none of the reported issues with a few MOS Glocks using this method over the past 3 years with over 12,000 rounds on three separate MOS pistols (Gen4 G17 MOS, Gen5 G34 MOS, and my new Gen5 G19 MOS/FS).

    *I'm currently experimenting with the C&H Precision MOS adapter plates on my MOS Glocks. Too soon to recommend it yet as I only have around 1,000 rounds on it at this point, but It appears to be a superior adapter plate for the MOS platform as it supports the Trijicon RMR front & rear instead of just relying on the recoil lugs and the two mounting screws. The C&H plate also completely covers the bottom of the RMR's footprint.

    *Im gonna do an RMR install on a co-workers new Gen5 G19 MOS/FS tonight and I'll make a video to post here to hopefully help out.
    Last edited by NickDrak; 10-13-2018 at 09:57 PM.

  2. #2
    Site Supporter cornstalker's Avatar
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    Very good info. Thanks for posting this.

    The screws that come with the RMR that are too long are very easy to trim to the right length with the screw cutter on a good set of wire strippers. Are they made of an inferior material, or just too long?

    ETA: I look forward to your video.
    Last edited by cornstalker; 10-13-2018 at 09:59 PM.

  3. #3
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    Nik - can you post the video you did on this ? It was pretty good.

  4. #4
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    Great thread. Where did the torque values come from? Do you do anything specific to seal the optic?
    Last edited by Super77; 10-13-2018 at 11:43 PM.

  5. #5
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    I also used the VibraTite Vc-3. I just tightened using the short end of the wrench thatís probably pretty close to 15 inch pounds. After 500 rounds nothing has loosened and still seems solid. One thing I did do is make 2 very small gaskets using a hole punch to punch out 2 small circles out of some helicopter tape. I stuck those to the screw heads of the mos plate which made them flush with the top of the rmr mounting plate. This makes it impossible for them to back out after you mount the rmr and youíll only need to keep an eye on the rmr screws.
    Last edited by Mfbpt; 10-14-2018 at 02:47 PM.

  6. #6
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    I did just order one of the C&H plates. They look really solid and clean looking. Thanks for the tip

  7. #7
    Site Supporter Trukinjp13's Avatar
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    May I piggyback something here?

    If you run into a screw you cant loosen from installing say red loctite. Be very careful with the chinese torx bits. They can very easily strip the screw out. I would suggest getting ahold of a snap-on bit. A lot harder metal and can save from having to drill a screw out. I know they are expensive. But sometimes you just need the right tool.

    This thread should get a sticky. Just saying. You will help a lot of people here if they listen. The mrds and optics ready pistols are becoming huge, and this can apply to the others as well, if you pay attention lol. Thank you.

  8. #8
    Site Supporter NickDrak's Avatar
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    Quote Originally Posted by Trukinjp13 View Post
    May I piggyback something here?

    If you run into a screw you cant loosen from installing say red loctite. Be very careful with the chinese torx bits. They can very easily strip the screw out. I would suggest getting ahold of a snap-on bit. A lot harder metal and can save from having to drill a screw out. I know they are expensive. But sometimes you just need the right tool.

    This thread should get a sticky. Just saying. You will help a lot of people here if they listen. The mrds and optics ready pistols are becoming huge, and this can apply to the others as well, if you pay attention lol. Thank you.
    Absolutely! Make sure you're using quality Hex/Torx bits when installing the screws. Otherwise you will eventually end up stripping out the heads of the screws. I have a nice kit from Chapman Tool that I ordered off of Amazon that I use.

  9. #9
    Site Supporter NickDrak's Avatar
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    Quote Originally Posted by Mfbpt View Post
    I did just order one of the C&H plates. They look really solid and clean looking. Thanks for the tip
    Make sure you use the BattleWerx RMR mounting screws and NOT the screws provided in the Trijicon Sealing plate kit for the Glock MOS. The Trijicon screws are just slightly too long and will protrude through the bottom of the C&H Precision adapter plate. The BattleWerx screws are the perfect length for the C&H plate install.

  10. #10
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    Did you even use the sealing plate on the C&H plate?

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