I’m curious about people’s experience with factory Glock MOS adapter plates. I’ve read quite a bit, and the majority seems to be against them. However, my experience to date has been positive. My G45 MOS has a Deltapoint Pro mounted on the OEM plate with about 800 rounds thus far with no issues. Do they tend to have a limited lifespan or perhaps maybe it was installer error that caused some issues folks listed online?
Factory Glock MOS Adapter Plates
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Wiz43
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I’m curious about people’s experience with factory Glock MOS adapter plates. I’ve read quite a bit, and the majority seems to be against them. However, my experience to date has been positive. My G45 MOS has a Deltapoint Pro mounted on the OEM plate with about 800 rounds thus far with no issues. Do they tend to have a limited lifespan or perhaps maybe it was installer error that caused some issues folks listed online?
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316 Posts
I've only had my G19 MOS for a few months, used the Holosun 507C adapter plate that came in the MOS package. I've been shooting a lot getting used to the Holosun, the plate hasn't been an issue, haven't had to tighten the screws, the sight has held zero very well during several range sessions. No issues to report at all.
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679 Posts
Marketing and fear of missing out are the backbone of the firearms industry. Billions of dollars are spent every year on doodads and whatnots that most shooters don't actually need.
At their core, most guns do exactly what they are supposed to do straight from the factory.
MOS plates work just fine. However, there is a market for people that think that a monolithic piece of steel needs improved upon, so we get aftermarket MOS plates.
At their core, most guns do exactly what they are supposed to do straight from the factory.
MOS plates work just fine. However, there is a market for people that think that a monolithic piece of steel needs improved upon, so we get aftermarket MOS plates.
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925 Posts
Glock plates are not as flat as they could be (the ones that came with my G34 and G19 MOS both had issues sitting flat on the slide.) They lack any additional support to "capture" the optic body. They are made of MIM, which combined with the imprecision in manufacture, can lead to stress in the plate as the optic flexes on the slide, bending the plate slightly with each round. This stress can create cracks in the plate, and if unchecked, result in the optic flying off under use. I would install them exactly as per the Glock MOS instructions, using a calibrated torque wrench at 13.3 in lb. I would also torque stripe the screws, and periodically check them for tightness.
For me personally, I decided the disadvantages of the MOS plates were enough to look at other solutions. I've been running two HS 507C's for approximately 2,500 rounds on Forward Controls OPF-G, RMR plates. I like the fact they are nitrided steel. The built in fences fore and aft help to position the optic securely. The fit of the optic body is almost a press fit into the plate, even with no retaining screws. The finish of these plates is extremely high, and they sit flat on the slide with zero movement.
For me personally, I decided the disadvantages of the MOS plates were enough to look at other solutions. I've been running two HS 507C's for approximately 2,500 rounds on Forward Controls OPF-G, RMR plates. I like the fact they are nitrided steel. The built in fences fore and aft help to position the optic securely. The fit of the optic body is almost a press fit into the plate, even with no retaining screws. The finish of these plates is extremely high, and they sit flat on the slide with zero movement.
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7,457 Posts
There is no issue with MOS. Early reports of mounting issues were folks using the wrong screws (too long) and messing it up. If one followed the instructions, used the correct plate, and used the correct screws all was fine.
Yes, a milled slide allows the sight to sit lower.
Yes, a milled slide may more securely hold the optic.
But those advantages have legitimate counterpoints. To get the milled lower fit, you have to sacrifice a slide (which Glock is unwilling to sell, which is baffling considering their competitors all do!), and pay the added cost of milling and addressing the newly exposed steel (do you nitride it, etc.).
And if a better/improved/bigger/smaller optic comes out in six years, a milled slide is stuck. A new MOS can be easily supplied (or created). How long will a gun last and still be current compared to a red dot (both longevity AND technology changes)?
I see both as fine, but I don't fear the MOS. I like it, and have been able to put a couple different red dots on the same gun. I am willing to sacrifice 2mm of height increase for the cost savings, hassle avoidance, and future flexibility.
I may still have a gun milled (not a Glock... see my slide complaint earlier!) for a red dot. If I do, I am sure I will enjoy those benefits (and endure the risks), too!
Yes, a milled slide allows the sight to sit lower.
Yes, a milled slide may more securely hold the optic.
But those advantages have legitimate counterpoints. To get the milled lower fit, you have to sacrifice a slide (which Glock is unwilling to sell, which is baffling considering their competitors all do!), and pay the added cost of milling and addressing the newly exposed steel (do you nitride it, etc.).
And if a better/improved/bigger/smaller optic comes out in six years, a milled slide is stuck. A new MOS can be easily supplied (or created). How long will a gun last and still be current compared to a red dot (both longevity AND technology changes)?
I see both as fine, but I don't fear the MOS. I like it, and have been able to put a couple different red dots on the same gun. I am willing to sacrifice 2mm of height increase for the cost savings, hassle avoidance, and future flexibility.
I may still have a gun milled (not a Glock... see my slide complaint earlier!) for a red dot. If I do, I am sure I will enjoy those benefits (and endure the risks), too!
I’ve basically the same thoughts as most here, that any issue with the plates was likely related to the installation, wrong screws, over/under torqued, etc. or just basic abuse. Not to say the plates couldn’t fail, certainly any item can and does. But, MOS is a great option for me, I like it a lot and it’s treating me and my DPP well.
The Holosun SCS seems interesting. Not to get off track, but I’ll be interested to see if other manufacturers come out with a similar concept. That’s a clean option for a red dot on the MOS. And gets you the direct milled effect without carving up one’s pistol.
The Holosun SCS seems interesting. Not to get off track, but I’ll be interested to see if other manufacturers come out with a similar concept. That’s a clean option for a red dot on the MOS. And gets you the direct milled effect without carving up one’s pistol.
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4,616 Posts
I'll answer this way. I'm not using Glock's MOS adapter plates. I waiting for Holosun's "SCS" model to come out once it was announced and I'm very happy with it. (I am hoping Glock releases its G26gen5MOS someday soon in the USA but have neither heard/seen any progress yet.)
Before recently buying my G19Gen5MOS, I was wondering if Glock was commercially going to release models pre-milled for either the RMR or DPP footprints, but these didn't materialize either.
I was aware of some of the YouTube experts' negative Glock-brand MOS-plate-opinions, but didn't want to spend the ~$100 (sometimes more) for an aftermarket plate PLUS different backup sights; although Ameriglo came out with its "Haven" rmr-footprint sight which could be bought with a set of taller Ameriglo sights for a seemingly reasonable price (Ameriglo was then also considered).
A good inch-pound torque wrench was also not cheap, but I did already own this tool and a set of Torx bits. I admit, when I first started considering this red or green dot on a Glock stuff, it was getting complicated with pricing; mounting plates; sealing plates-or-not; which optic; which iron sights & heights; and screw lengths; whether to get a slide custom milled; and reports of optics coming loose. All this was enough for me to lose interest for a few years until just a few of months ago.
Before recently buying my G19Gen5MOS, I was wondering if Glock was commercially going to release models pre-milled for either the RMR or DPP footprints, but these didn't materialize either.
I was aware of some of the YouTube experts' negative Glock-brand MOS-plate-opinions, but didn't want to spend the ~$100 (sometimes more) for an aftermarket plate PLUS different backup sights; although Ameriglo came out with its "Haven" rmr-footprint sight which could be bought with a set of taller Ameriglo sights for a seemingly reasonable price (Ameriglo was then also considered).
A good inch-pound torque wrench was also not cheap, but I did already own this tool and a set of Torx bits. I admit, when I first started considering this red or green dot on a Glock stuff, it was getting complicated with pricing; mounting plates; sealing plates-or-not; which optic; which iron sights & heights; and screw lengths; whether to get a slide custom milled; and reports of optics coming loose. All this was enough for me to lose interest for a few years until just a few of months ago.
It does sound complicaed. I’m trying to decide on my set up. Thinking 19 gen 5 mos and Holosun 507c. What night sites and plate would you recommend? ive seen forward control plates recommended, but on their sites it mentioned thein RMR plates were not recommended for Holosun. Thanks in advance.
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4,616 Posts
Post 13, I think folks have used the Forward Controls (FC) plates with Holosun, but as you mentioned, FC doesn't seem to be supporting its plates with Holosun at all. Read the red-colored fine print:
I therefore recommend a different plate, such as CHPWS.com or as I previously said, go with the Holosun SCS, which omits the plate and Glock's stock or standard-height sights can be used, which is also a money-saving way of doing things if that's of interest.
Alternatively, here's the Ameriglo "Haven" sights I mentioned in my Post 12, above:
I don't know how well an FC plate will work with the Ameriglo or if filing/files and different length screws will need to be obtained.
I therefore recommend a different plate, such as CHPWS.com or as I previously said, go with the Holosun SCS, which omits the plate and Glock's stock or standard-height sights can be used, which is also a money-saving way of doing things if that's of interest.
Alternatively, here's the Ameriglo "Haven" sights I mentioned in my Post 12, above:
I don't know how well an FC plate will work with the Ameriglo or if filing/files and different length screws will need to be obtained.
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