Monstrum Dovetail RMR, 407C/507C, XR Footprint Mounting Plate for Glock Pistols | for Non-MOS Version Glocks | Compatible with Glock 17 19 20 21 22 23 34 35 40 41 45 47 | Compatible with RMR Red Dots

Red dot fit perfectly. Slight overhang on the edges of the slide but works and fits well.

Perfect for testing optics on not OR platforms. I ran this on a Gen 4 19 for about a year before I determined I wanted a red dot permanently and got my slide cut. I would not suggest using it forever, but as a simple quick solution and/or cheap trial run it was great. For the year it did hold zero, but I wouldn't have confidence with prolonged use.

Item works. It's not the best way to mount a red dot, but is really my only option that's affordable for my Glock 22 Gen1. Not gonna pay for custom cutting on my original hard chrome slide. And a new cut slide is overly expensive. $400.00 for a new one with optics cut. Ouch

Mounting is a bit of a pain unless you have a larger sight pusher. I had to gently tap it into place. Footprint is exact and fits my Holosun 407c perfectly on my Gen3 Glock 23

The only reason I gave it one star is cuz there wasn't an option for zero stars! I used this on my Glock 17. Didn't fit as described the screws were too long first off. No problem I'm a machanicly inclined guy so I took them to the ole grinder and go them to the perfect length and put em on first screw set good but the second screw seemed like it stripped the threads so I didn't dare tighten any more. I did use locktite on everything as well. Let it set over night and tested it the next day. Second shot it flew off and hit me in the forehead!! Not to mention my optic went flying in the dirt!!! Save yourself alot of headaches and DONT BUY THIS PRODUCT!

I use a lot of Monstrum products and haven't been disappointed yet. This high quality adapter plate is perfectly sized to slide into my G19, 17L and 21L with no problems. My 21 is converted to 460 Rowland which produces near 44 mag ballistics and this adapter plate has survived over 500 full-power loads. The sight fit tightly and when snugged down with some Loctite, hasn't moved. Installation is so easy a caveman can do it as long as he has some common sense.

Product is solid but included optic screws were too short and the screws that came with my optic were smaller than the mounting holes

Although some reviews had difficulty installing the plate, it was not problematic using a sight pusher. Installation was less than 5 minutes. Included was every possible screw length you could need to finish the red dot installation. I am very satisfied.

Save your money for a more expensive plate. The screws from my optic sheared the threading out of the plate after firing about 50 rounds.