Monstrum Dovetail Red Dot Mounting Plate for Glock Pistols | for Non-MOS Version Glock 17 19 20 21 22 23 34 35 40 41 45 47 | Compatible with Holosun RMSc/407k/507k/K Footprint Red Dots

Another great product from Monstrum Tactical. I needed to add a small red dot to an older Glock. This did the job nicely using the dovetail rear sight cut on the slide. This is not one of those flimsy items I keep coming across. This is well made and fits perfectly. (You need a sight pusher to install it. All the hardware and simple tools needed are in the package. (Including mounting screws for the Red Dot itself) I used a CT RAD optic that has an integrated rear sight cut built into it for co-witnessing. Very pleased with the result.

Only gone through about 150 rounds so far so it’s a little early to tell but seems pretty legit nothing to really complain about everything fit correctly it held zero and hasn’t moved since. For reference I put mine on my Gen 5 Glock 19x

It works fine if you know your footprint and you follow the instructions. It WILL loosen and move side to side IF you take shortcuts and don't use the expanding lugs. Unfortunately, you don't need a brain to leave bad reviews for a perfectly fine product. In fact, it helps, if you don't.

Appears durable and fit perfectly and sugly but plate is thicker than expected and RDS I wanted to mount, Vortex Defender, doesn’t have enough MOA depression to correctly sight in dot. Likely will have to have my G23 slide cut for RDS which I didn’t want to do and why I decided to try this plate.

Perfect fit, works great with green dot sight. Great value for the money.

Installed on my Glock 19x and went and shot about 200 rounds and the soft aluminum did not handle the heat and recoil of the gun. I would not recommend for a shooter that puts a lot of rounds down range

Bought and used on a Gen 5 Glock 19, bought prior to the MOS version release and did not thing future for adding a red dot. This is a good compromise if you don’t want to spend a bunch of money on a new pistol or a new slide or getting your slide cut. This is also a great option if you’re unsure about red dots on pistols, but keep in mind this version a dedicated mount are different. So far I haven’t had issues with loosing zero or it coming loose. In fact during installation it was quite tight and had to be beat to get into place. Don’t be afraid if it doesn’t just slide in with a few simple taps, it’s gonna take some work to get it in but that only further leads to it holding zero and being a solid mount.

I was happy with the attention to detail in packaging and the overall appearance of quality. I had to do a slight bit of filing on the dovetail’s anodizing for it to fit nice and tight on my Glock’s slide with just a little light tapping. I did not mind the extra work to get the fitment just right. It makes for a much more secure mount. The problem was after everything was centered perfectly and the set screw was locktighted in place, when I was mounting the RDS to the mount, one of the screws would not start into the mount’s threads because of either too much anodizing or poor machining. So the whole thing had to be uninstalled and the I had to run a tap through the threads. From the amount of shavings, I have to conclude that it was poor machining. Not a deal breaker for me. Sh”t happens and you can’t inspect every single piece that gets manufactured at the price point these mounts are sold for. But, I did want to let anyone that does not have a minimum of mechanical skills to know that they may or may not encounter difficulties and need a hand with installation. Obviously, I can not comment on durability until I run through a couple of qualification sessions with it, and honestly this was only purchased by me to try and see if I wanted to go through the process of milling a slide or two on my pistols and use a RDS permanently.