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Posted: 7/8/2026 12:50:27 PM EDT
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Alright, do I get a RMR HD for my 19.5 or just buy a COA 19.6? Blue Label pricing is not super far from just buying a COA but the light sensor on the HD has me really leaning that way. The 19.5 has a dedicated RMR cut FWIW. |
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I was gifted a Gen 6 19 right when they came out, so I did not have a say in getting the COA or not (nor am I complaining). The COA was announced a couple weeks after the fact. If I were actually looking to buy a gen 6 19, I would likely pick up the COA model. That said, I have an RMR HD on the 19 and I love it and do not plan to pick up the COA version. What I have is more than solid considering I have used RMRs for ages now and know what I need to do on my part to keep things good to go (take a Qtip from time to time and lightly wipe the lens with some water). I would guess it boils down to whether the industry will release more A-CUT optics or not. Meaning, will the A-CUT pick up similar traction as the RMR foot print did. That would justify the A-CUT Glock a whole lot more as I do think its interface is superior. Currently, I think the regular Gen 6 is more friendly to what could be released in the future as its still has a modular optics plate/insert system. Gen 5 with a solid aftermarket optics plate is perfectly fine too in my book, though the Gen 6 cut is an improvement. If you think the COA itself is the bee's knees and you do not necessarily care for future optics compatibility with the A-CUT slide, I would say go for the COA. Also, I tried the auto sensing on the RMR HD, it works as advertised, but I do not use it at all. YMMV. |
If there was an A-CUT RMR HD, I'd be all over it. I love that optic, but there isn't. So at this time I love the COA.  How Durable Is The Glock A-CUT ??? |
If you are putting a lot of effort into arguing with me, you are probably really just wasting your time, sorry.
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I will go against the crowd. I have both COA and HD. I like the COA mounting system more and enjoy the large window with small footprint. The RMR HD auto adjust feature is superior to having to set a brightness and leave it for all applications like the COA. The ability to be in a dark room and point out into light or the reverse is awesome. Its response time is incredibly fast compared to the type 2. I also have years of RMR practice under my belt and the HD is close enough that those years translate to actual performance which did not 100% translate to the COA. Be aware the overall height is higher on the HD compared to type 2 or COA. I ended up putting the COA in the safe and carry a G19.6 with HD using a FCD plate that fits so tight it took some effort to get it to seat in the pocket of the slide. |
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If starting fresh...the G19.6 COA is hard to beat at around $1100-1200 (sub $900 on Blue Label) versus the $1300 on the lower end of a G19.5 + RMR HD + mounting plate + taller sights. Though the "cheapest" option is to just slap an RMR HD on the G19.5; though with a plate of your choice you're probably over $800 into it by then. Trijicon prices are higher than Hunter Biden... |
What have the Romans ever done for us?
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| Id get the 19COA if its going to cost you roughly the same as a RMRHD. The frame has a few upgrades to it over the G5 that would make it nice to have. |
What it boils down to is that they fear an effective resistance to their power: So, Left in power=Guns bad, mmmmkay...?, Right in power=Guns good!-thskirk
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Well, I did the math and I can sell what I have and buy a new Gen 6 COA for less out of pocket than buying any optic that I would actually put on a pistol. I like the features of the HD but I’m also OK with setting my dot for outdoor/WML brightness and leaving it alone. COA it is. |
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Have a Glock 19X with an RMR HD (MOS mount) and a gen 5 Glock 19 with an Aimpoint COA. The COA was meant for the Glock slide. It just works better and lines up better. The Glock 19X with a RMR HD is still a good set up, with a slightly wider FOV, but thanks to Glock's grip angle, I feel the AImpoint COA works better since it sits lower and lines up with standard iron sights. I still struggle at times with higher optic mounts on various handguns when drawing from a holster on a shot timer. Aimpoint COA less so. Yes, need more training and practice, but it's hard when I work 60-80 hours a week  Edited to add: Forgot to mention the biggest advantage of the Aimpoint COA is the crystal clear glass. There is no green tint or darkened hue like you see on the Holosuns. |
Elite Soviet Democrat
What have the Romans ever done for us?
Joined:
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Posts:
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EE: 100% (212)
TN, USA
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Acquired 45.6 COA slide and sold the 19.6 slide. Net cost +/- $450. Cheaper than RMRHD 
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Panem et Circenses
I have also learned from experience that the greater part of our happiness or misery depends upon our dispositions, and not upon our circumstances.
Kites rise highest against the wind, not with it. - Churchill
I have also learned from experience that the greater part of our happiness or misery depends upon our dispositions, and not upon our circumstances.
Kites rise highest against the wind, not with it. - Churchill
