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Posted: 4/5/2019 10:37:48 PM EST
[Last Edit: DOE]
Has anyone had a problem with the MOS platform? Screws shearing off? I spoke to a G-rep/tech, who will be nameless. I ask, "How's the MOS system?" He looks around (behind us as well) and then comments that they had a lot of issues with the aforementioned problem. 70% success rate in getting the broken screws out without damaging the rest of the slide. The other, not so much.
 The screws hold the mrds to the plate. There's a gap fore and aft of the mrds. As the slide recoils, all the stress is put on those two screws, since there is movement to the mrds. The problem also occurs when you try to remove the mrds. Anyone had this issue? Resolution? Round count? |
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Posted: 4/5/2019 10:49:56 PM EST
[#1]
They’re not the best. Should have a slide plate that isn’t cast.
The index pins on the adapter plates should carry some of the shear load, if not all. |
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Posted: 4/5/2019 10:59:43 PM EST
[#2]
Screws shearing shouldn’t be a problem if one is using the right screws. If you’re using the screws that came with the MOS, you’re not using the right screws. The ones supplied have like a single thread engaged. I got mine from Fastenal, but if one is so inclined, one can pay an order of magnitude more for Gucci ‘correct’ ones.
Torque to spec, apply loctite/vibratite, and you’ll be fine. I agree that the MOS is not an ideal setup, particularly if one knows what red dot they want and don’t plan on switching. Still, most of the issues with the MOS are user error. Between my MOS 19 and 34 I’m up to around 3k rounds since Christmas RMR’d, and they work fine. 19.5 MOS on my hip as I type this. |
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AZ, USA
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Posted: 4/5/2019 11:00:08 PM EST
[#3]
It's a Glock - they haven't even fixed the grip angle in 30 years. MOS nonsense is in the noise for me. Best approach is to have a regular gun's slide machined for the red dot by a competent gunsmith.
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Posted: 4/6/2019 3:35:41 AM EST
[#4]
Quote HistoryOriginally Posted By StealthyBlagga:
It's a Glock - they haven't even fixed the grip angle in 30 years. MOS nonsense is in the noise for me. Best approach is to have a regular gun's slide machined for the red dot by a competent gunsmith. Quote HistoryOriginally Posted By StealthyBlagga:
It's a Glock - they haven't even fixed the grip angle in 30 years. MOS nonsense is in the noise for me. Best approach is to have a regular gun's slide machined for the red dot by a competent gunsmith. Originally Posted By doty_soty:
Screws shearing shouldn’t be a problem if one is using the right screws. If you’re using the screws that came with the MOS, you’re not using the right screws. The ones supplied have like a single thread engaged. I got mine from Fastenal, but if one is so inclined, one can pay an order of magnitude more for Gucci ‘correct’ ones. Torque to spec, apply loctite/vibratite, and you’ll be fine. I agree that the MOS is not an ideal setup, particularly if one knows what red dot they want and don’t plan on switching. Still, most of the issues with the MOS are user error. Between my MOS 19 and 34 I’m up to around 3k rounds since Christmas RMR’d, and they work fine. 19.5 MOS on my hip as I type this. |
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Posted: 4/6/2019 8:16:02 AM EST
[Last Edit: JohnMH92]
[#5]
http://www.chpws.com/product/trijicon-rmr-holosun-glock-mos-adapter-plate-v3
I have one. Have 200 rds through it and putting 500 more through it later today. Have it on a g19 gen 5 MOS. Will update later. So far so good. Will include pics later as well |
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AZ, USA
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Posted: 4/6/2019 8:23:02 AM EST
[#6]
The MOS is a POS.
If you want an optic on a Glock, just have the slide milled. |
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ID, USA
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Posted: 4/6/2019 8:58:47 AM EST
[#7]
I’ve got 2 milled and an mos 34 that I have more rounds than the 2 milled combined. At 50 rounds the mos shot loose so I used vibratite and torqued to 15 inch pounds and has been problem free since (lost count after 2000 rounds). The milled 19x and 45 are definitely more solid as the rmr kind of snaps into the pocket like a lego and they look better. I just wish someone would come out with an aftermarket mos plate that had a cleaner look. That CHP plate is alloy so there’s no way I’m using that on a handgun slide. I know people claim it to be problem free but I don’t trust it. I’d gladly pay double for a steel version.
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Posted: 4/6/2019 10:54:25 AM EST
[#8]
I had problems because I used the wrong screws.
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Posted: 4/6/2019 1:46:33 PM EST
[#9]
Zero problems with mine.
That being said, I use proper screws, own quality de-greaser, and thread locker. Usually problems traced to the "system" come from someone missing one or more of the above. That being said, milled would be the best option. I, however, can't use milled. But I do trust the MOS system for a duty setup. |
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WI, USA
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Posted: 4/6/2019 4:05:13 PM EST
[#10]
Quote HistoryOriginally Posted By Marksman14:
That being said, milled would be the best option. I, however, can't use milled. But I do trust the MOS system for a duty setup. |
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Posted: 4/6/2019 5:52:01 PM EST
[#11]
have a gen 5 mos
4500ish rounds on it. 0 problems so far. |
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Posted: 4/6/2019 6:10:48 PM EST
[Last Edit: PabloMcGlock]
[#12]
Are you using the correct screws, OP? Trijicon sells a kit for mounting the Rmr to the MOS pistols. Trijicon part number AC32064
I have over 2000 rounds through the G19 pictured and over 10,000 rounds through another with zero issues.  Attached File |
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TN, USA
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Posted: 4/6/2019 6:15:13 PM EST
[#13]
I also was on the fence about getting a slide milled or going with the MOS. I know that getting a slide milled is the better option but I didn’t want to be without my only pistol while waiting for the slide to be milled. I ended up choosing a Glock 19.5 MOS and have put about 500 rounds through it so far. I used blue Locktite and witness marked all of the screws and everything has been solid so far. I am also testing the Holosun 507c and am pleased with it as well. I think no matter what you choose, you should have backup iron sights.
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Posted: 4/6/2019 6:34:47 PM EST
[#14]
Quote HistoryOriginally Posted By Marksman14:
Zero problems with mine. That being said, I use proper screws, own quality de-greaser, and thread locker. Usually problems traced to the "system" come from someone missing one or more of the above. That being said, milled would be the best option. I, however, can't use milled. But I do trust the MOS system for a duty setup. |
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PA, USA
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Posted: 4/6/2019 6:48:10 PM EST
[#15]
I have a 34 MOS with about 3k rounds thru it with a Vortex Venom on it. Never one problem.
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Posted: 4/6/2019 7:57:10 PM EST
[Last Edit: doty_soty]
[#16]
Quote HistoryOriginally Posted By Honda4828: What are the proper screws? http://jagerwerks.com/rmr-screws-t10-torx-wrench/ I got comparable screws from Fastenal, and paid about $3 for 10. Apparently either work, because after 3k rounds mine are still screwing along just fine. |
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Posted: 4/6/2019 8:24:28 PM EST
[#17]
Quote HistoryOriginally Posted By doty_soty:
We did this a couple weeks ago: http://jagerwerks.com/rmr-screws-t10-torx-wrench/ I got comparable screws from Fastenal, and paid about $3 for 10. Apparently either work, because after 3k rounds mine are still screwing along just fine. Quote HistoryOriginally Posted By doty_soty:
Originally Posted By Honda4828: What are the proper screws? http://jagerwerks.com/rmr-screws-t10-torx-wrench/ I got comparable screws from Fastenal, and paid about $3 for 10. Apparently either work, because after 3k rounds mine are still screwing along just fine.  . So I’m trying to play catch up. Looking at a gen 5 19 mos, Trijicon hrs, Mags, 13.5-1lh threaded barrel, taller sights, holster, and now screws lol. My wife is going to shoot me with it
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Posted: 4/6/2019 8:57:25 PM EST
[#18]
Quote HistoryOriginally Posted By Honda4828: What are the proper screws? Another poster listed the part number above. It also includes the sealing plate. Works perfectly. If someone had the specific dimensions for the screws, that would be awesome.... |
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Posted: 4/6/2019 9:06:05 PM EST
[#19]
Quote HistoryOriginally Posted By Honda4828:
What are the proper screws? Quote HistoryOriginally Posted By Honda4828:
Originally Posted By Marksman14:
Zero problems with mine. That being said, I use proper screws, own quality de-greaser, and thread locker. Usually problems traced to the "system" come from someone missing one or more of the above. That being said, milled would be the best option. I, however, can't use milled. But I do trust the MOS system for a duty setup. Thanks in advance for the info |
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Posted: 4/6/2019 9:15:39 PM EST
[#20]
Quote HistoryOriginally Posted By 1Tribe:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @Marksman14 Thanks in advance for the info |
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MI, USA
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Posted: 4/6/2019 9:25:53 PM EST
[#21]
Milled is great. Agency's AOS system is great, especially if you want to play around with other optics. C&H Precision MOS plates are a huge improvement over the Glock MOS plates. Proper screws, perfect length, proper install is the key. I use the C&H plates (Prefer V3), rack slide off of trees, tables or whatever. No issues. Plates don't solely depend on screws as the plate locks in the optic and V3 has 2 lugs.
Don't have a pic yet of V3 but here's a glimpse at the V2.  " />
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Posted: 4/6/2019 9:59:14 PM EST
[#22]
Quote HistoryOriginally Posted By DetroitSounds:
Milled is great. Agency's AOS system is great, especially if you want to play around with other optics. C&H Precision MOS plates are a huge improvement over the Glock MOS plates. Proper screws, perfect length, proper install is the key. I use the C&H plates (Prefer V3), rack slide off of trees, tables or whatever. No issues. Plates don't solely depend on screws as the plate locks in the optic and V3 has 2 lugs. Don't have a pic yet of V3 but here's a glimpse at the V2. https://i.imgur.com/xEtm5Ye.jpg" target="_blank">https://i.imgur.com/xEtm5Ye.jpg |
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Posted: 4/6/2019 10:04:38 PM EST
[#23]
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Posted: 4/6/2019 10:39:31 PM EST
[#24]
Quote HistoryOriginally Posted By DetroitSounds:
Milled is great. Agency's AOS system is great, especially if you want to play around with other optics. C&H Precision MOS plates are a huge improvement over the Glock MOS plates. Proper screws, perfect length, proper install is the key. I use the C&H plates (Prefer V3), rack slide off of trees, tables or whatever. No issues. Plates don't solely depend on screws as the plate locks in the optic and V3 has 2 lugs. Don't have a pic yet of V3 but here's a glimpse at the V2. https://i.imgur.com/xEtm5Ye.jpg" target="_blank">https://i.imgur.com/xEtm5Ye.jpg The lugs are awesome and taking the bit of gap out helps keep the rmr locked in place. The kit comes with 2 proper screws to mount the plate and 2 proper screws to mount the rmr. No sealing plate needed. Can’t say enough good things about it. |
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ID, USA
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Posted: 4/6/2019 10:41:42 PM EST
[#25]
Quote HistoryOriginally Posted By Marksman14: Did they finally make plates out of steel or still aluminum? |
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TN, USA
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Posted: 4/7/2019 10:01:31 AM EST
[#26]
I have a G40 MOS. My 190 gr cast handloads run 1350 FPS. I had problems until til buying the trijicon screws. No problem since.
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Posted: 4/7/2019 10:40:19 AM EST
[#27]
Quote HistoryOriginally Posted By JohnMH92:
http://www.chpws.com/product/trijicon-rmr-holosun-glock-mos-adapter-plate-v3 I have one. Have 200 rds through it and putting 500 more through it later today. Have it on a g19 gen 5 MOS. Will update later. So far so good. Will include pics later as well |
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Posted: 4/7/2019 12:10:44 PM EST
[#28]
C&H V3 RMR plate as promised.
Total of about 700 rds through it. And yes I’m working on getting lower 1/3-1/4 sights. Right now those will do while I learn the RMR 
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Posted: 4/7/2019 1:54:45 PM EST
[#29]
Quote HistoryOriginally Posted By azcheesehead:
The MOS is a POS. If you want an optic on a Glock, just have the slide milled. |
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ID, USA
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Posted: 4/7/2019 4:02:58 PM EST
[#30]
Quote HistoryOriginally Posted By Dana1972:
No it’s not. People just don’t know how to listen or follow simple instructions. Quote HistoryOriginally Posted By Dana1972:
Originally Posted By azcheesehead:
The MOS is a POS. If you want an optic on a Glock, just have the slide milled. |
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Posted: 4/7/2019 5:58:36 PM EST
[#31]
I've had mine on for about 14 months and can guess between 2 or 3 thousand rounds without issue. I put it myself with the Trijicon mounting hardware (spring steel plate and screws).
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NOR
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Posted: 4/7/2019 9:57:59 PM EST
[#32]
Quote HistoryOriginally Posted By Dana1972:
Are you using the correct screws, OP? Trijicon sells a kit for mounting the Rmr to the MOS pistols. Trijicon part number AC32064 I have over 2000 rounds through the G19 pictured and over 10,000 rounds through another with zero issues. https://www.AR15.Com/media/mediaFiles/312349/7CB3A34D-1535-4872-8ED9-E2D6B108533B_jpeg-903523.JPG 
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NOR
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Posted: 4/7/2019 10:03:08 PM EST
[#33]
@JohnMH92
Thanks for the pics. Can you post additional of the rear. Is the RMR sandwiched in there? Drop in? |
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Posted: 4/7/2019 10:18:32 PM EST
[Last Edit: JohnMH92]
[#34]
@DOE The plate was unable to move back and forth during installation when being screwed onto the slide. It fits perfectly in there. The two lugs plus the size of the plate being exact to rmr spec makes it so it cannot move sideways or back and forth on the plate. The screws which have plenty of bite do nothing but hold it down to the plate. |
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NOR
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Posted: 4/8/2019 2:01:27 AM EST
[#35]
@JohnMH92
Thanks for taking the time to do that!
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Posted: 4/8/2019 10:36:14 PM EST
[#36]
Quote HistoryOriginally Posted By DOE: Yes, I have the correct screws from Trijicon's RMR kit. I was wondering if anyone from the community had this issue with the MOS platform. |
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Posted: 4/9/2019 5:39:42 AM EST
[#37]
I have a leupold deltapoint on my G40, no issues yet.
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Posted: 4/11/2019 8:42:51 PM EST
[#38]
@DOE
My experience with the fit of the V3 plate mirrors JohnMH92's. In fact, after attaching the plate it was such a PITA to get the RMR into the slide+plate that I thought C&H had cut it too small. Turns out it was just REALLLY tight tolerances and the RMR had to be exactly 100% level sliding down into the plate; any forward or backward tilt at all and the high side of the RMR wouldn't clear into the plate. Now that it's installed that baby isn't going anywhere unless it's being purposely taken off. Since there's pics, I'll add mine - though it was taken before I installed my Dawson Precision sights. -bob  Attached File |
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NOR
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Posted: 4/12/2019 3:48:23 AM EST
[#39]
@Bob_L
Thanks for the update. I might request a T&E for review from CH. Looks better than stock. Why didn't Glock come up with that? Ya Think? Even FN has a better interface. Only concern is aluminum, but if its 6000 or 7000 series grade, it should be good to go. |
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Posted: 4/13/2019 6:18:55 AM EST
[#40]
Quote HistoryOriginally Posted By JohnMH92:
C&H V3 RMR plate as promised. Total of about 700 rds through it. And yes I'm working on getting lower 1/3-1/4 sights. Right now those will do while I learn the RMR https://i.imgur.com/X8g3pfG.jpg https://i.imgur.com/kjo0M90.jpg https://i.imgur.com/uVGKZQX.jpg https://i.imgur.com/UbGvPGq.jpg https://i.imgur.com/WbfuquV.jpg https://i.imgur.com/vs0ieFp.jpg |
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Posted: 4/13/2019 6:30:33 AM EST
[#41]
Quote HistoryOriginally Posted By Honda4828: What are the proper screws? So 3/8 will be a little short (.375), 7/16 (.4375 - if you can find them) are a little long. Best bet would be to get some 1/2" ones and cut them back. https://www.mcmaster.com/torx-machine-screws I'll take Torx over hex. |
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Posted: 4/13/2019 7:28:08 AM EST
[#42]
While I'm posting in this thread...
Has anyone noticed the finish on the Gen 5s just isn't holding up as good as the previous generations? Today my G19.5MOS is 3 weeks old. My G17.4 that I used for competition for years isn't worn this bad. ( stopped keeping track of rounds in 2014 @ 18k )
It's not that it really matters, as this gun will probably become my EDC pistol and will have wear in the next few years. It just surprised me when I came in from the range on Thursday how worn it already was. 
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USA
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Posted: 4/13/2019 8:09:27 AM EST
[#43]
My 34 MOS will probably have a red dot on it at some point for competition. If I was going to carry a gun with a dot on it, it wouldn’t be an MOS.
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Posted: 4/13/2019 8:50:49 AM EST
[#44]
Quote HistoryOriginally Posted By Henny:
6-32 x .390 So 3/8 will be a little short (.375), 7/16 (.4375 - if you can find them) are a little long. Best bet would be to get some 1/2" ones and cut them back. https://www.mcmaster.com/torx-machine-screws I'll take Torx over hex. Quote HistoryOriginally Posted By Henny:
Originally Posted By Honda4828: What are the proper screws? So 3/8 will be a little short (.375), 7/16 (.4375 - if you can find them) are a little long. Best bet would be to get some 1/2" ones and cut them back. https://www.mcmaster.com/torx-machine-screws I'll take Torx over hex.
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Posted: 4/13/2019 8:52:56 AM EST
[Last Edit: doty_soty]
[#45]
Quote HistoryOriginally Posted By Henny:
While I'm posting in this thread...
Has anyone noticed the finish on the Gen 5s just isn't holding up as good as the previous generations? Today my G19.5MOS is 3 weeks old. My G17.4 that I used for competition for years isn't worn this bad. ( stopped keeping track of rounds in 2014 @ 18k )
It's not that it really matters, as this gun will probably become my EDC pistol and will have wear in the next few years. It just surprised me when I came in from the range on Thursday how worn it already was. http://i.imgur.com/zlidvqg.jpg http://i.imgur.com/LJX229g.jpg |
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Posted: 4/13/2019 10:50:21 AM EST
[#46]
Quote HistoryOriginally Posted By doty_soty:
I notice my 5's finish seem to be a little weaker as well, it's not a big deal or anything, but I notice it around holster rub areas. Moreso than my 4's, and I noticed it on my 4's more than on my frying pan 3's I used to have. They say it's weaker, but I think the older frying pan finish was the pinnacle of Glock finishes. Quote HistoryOriginally Posted By doty_soty:
Originally Posted By Henny:
While I'm posting in this thread...
Has anyone noticed the finish on the Gen 5s just isn't holding up as good as the previous generations? Today my G19.5MOS is 3 weeks old. My G17.4 that I used for competition for years isn't worn this bad. ( stopped keeping track of rounds in 2014 @ 18k )
It's not that it really matters, as this gun will probably become my EDC pistol and will have wear in the next few years. It just surprised me when I came in from the range on Thursday how worn it already was. http://i.imgur.com/zlidvqg.jpg http://i.imgur.com/LJX229g.jpg 
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Posted: 4/16/2019 11:24:15 AM EST
[Last Edit: Henny]
[#47]
Quote HistoryOriginally Posted By doty_soty:
I'm using 3/8. They work fine, but they could stand to be a little deeper. If you're set up to start with longer and cut them back, I'd do so just so you have the best setup. If 3/8 is what you've got, well, mine haven't unscrewed yet. Quote HistoryOriginally Posted By doty_soty:
Originally Posted By Henny:
Originally Posted By Honda4828: What are the proper screws? So 3/8 will be a little short (.375), 7/16 (.4375 - if you can find them) are a little long. Best bet would be to get some 1/2" ones and cut them back. https://www.mcmaster.com/torx-machine-screws I'll take Torx over hex.  Attached File Attached File Attached FileAs as you can see, they're pretty much a perfect fit. To me, the big advantage of these are they are the same size Torx bit as the Glock plate and it's a Torx. Less chances to round off like a hex. The disadvantage is is you have to paint the heads of the screws. No big deal, clean them with alcohol and hit them with flat black. If you notice on the parts drawing at the below link, the screw head diameter is smaller than the other 6-32 screws. https://www.mcmaster.com/90920a146 Note: I discovered the screw head size difference after my previous post. I thought I'd get some and see how they fit. The screw head is just small enough to make these work.
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Posted: 4/16/2019 11:30:01 AM EST
[#48]
Quote HistoryOriginally Posted By Henny:
While I'm posting in this thread...[ig]http://www.ar15.com/images/smilies/smiley_abused.gif[/img] Has anyone noticed the finish on the Gen 5s just isn't holding up as good as the previous generations? Today my G19.5MOS is 3 weeks old. My G17.4 that I used for competition for years isn't worn this bad. ( stopped keeping track of rounds in 2014 @ 18k [ig]http://www.ar15.com/images/smilies/smiley_abused.gif[/img]) It's not that it really matters, as this gun will probably become my EDC pistol and will have wear in the next few years. It just surprised me when I came in from the range on Thursday how worn it already was. http://i.imgur.com/zlidvqg.jg http://i.imgur.com/LJX229g.jg We did a lot of testing with DLC as we were considering it for barrels and slides at one point. It's overall not an impressive finish in the testing we did with it. I'd pick black nitride over it every day. |
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Posted: 4/16/2019 12:58:33 PM EST
[#49]
Installed some taller sights. More better
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SWE
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Posted: 4/16/2019 1:41:11 PM EST
[#50]
Dawson?
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