HOLOSUN SCS MOS Green Multi-Reticle 2 MOA Dot & 32 MOA Circle Parallax-Free Reflex Pistol Sight Compatible with Glock MOS Full-Size Handguns - Solar Charging Sight (NOT for Glock 43X MOS or 48 MOS)

Beautiful fit works on my spare slide third in G. 19 and G 34 no mounting plate required have a total co-witness even with factory sites great optic definitely a great purchase

This optic is a direct fit for Glock pistols (excluding G43 and G48). Bright green reticle that is better for those with astigmatism. No battery as the optic is solar powered. It is also relatively low profile, so you don't have to retro fit suppressor height sights. My optic was new in the box. Comes with a tool to assist in mounting, screws, cleaning cloth and user's manual. High quality optic. You will not be disappointed.

This is a great optic. Much sharper dot and "easier to find" than some of their competitors. Very easy to install. Trivial to "zero." After 500 rounds, it is holding zero and functioning perfectly.One downside (that I can live with) is the screws. Holsun is "cheap" compared to their competitors. They give you just the 2 required screws. If you mess one up or lose it, you're ... well, screwed. ~ $10 bucks to get another pair (This happened to me on an older Holsun 507C where I had to cut one of the screws that impinged on the extractor push rod...I cut the screw too short and spent over a month trying to a replacement.A second complaint is the fact that the screws they do provide come with a big "glob" of Loc-tight. These tiny, tiny screws with very fine threads are hard to start and you have to be very careful to not cross-thread them. The glob of pre-cured Loc-tight keeps you from feeling what you need to feel to be sure the screw is not cross threaded. It's hard to tell if the resistance to turning is from the Loc-tight or from cross threading. I much prefer clean screws that I can insert to test then apply LIQUID Loc-tight that lets you "feel the threads." Waiting 24 to 48 hours for the "fresh" Loc-tight to cure is a small penalty to pay for being sure you didn't "screw things up." (i.e. cross thread)Overall, a great value and I'll probably buy another one. I'd recommend it to my friends

God do I love these things, I’ve had my first one for about 1/2 a year now and it’s been a reliable workhorse and I hope it continues to glow for many, many years. I have a second one coming now for a Glock 26 MOS and I can’t wait to install it. I love how flush these sit and you don’t ever have to change the battery. I wish there were more variants of these optics they are truly a work of art. I will update this if either of them fail me. Edit: you will probably have to clean the lens with a q tip and a bit of glass cleaner everyday. Only downside to having an open emitter, otherwise this things a work horse. I wish they’d invest in they’re scs line 👏.

I ordered this optic for use on my new Glock 19 Gen 5 MOS. Part of the appeal is that it is designed to fit in the channel already machined into the slide of the gun without requiring an adapter plate. This reduced the number of parts needed to mount the sight (two screws, supplied) and improved the solidity of the mount. It went on without a hitch. It matches the finish on the gun's slide perfectly and allows one to use standard height iron sights to aim the gun if by some chance the optic might fail or you forgot to turn it on. I changed out the original Glock plastic sights and replaced them with some TruGlo tritium night sights, so I'm good to go regardless of lighting. I purchased a red laser bore sighter here on Amazon to roughly zero the optical sight. I then went to the range and the initial settings I made with the laser were nearly spot on - only a slight change in elevation - about an inch at 10 yards - gave me perfect results.The optic has two different reticles: a circle that is 32 MOA and a dot that is 2 MOA. You can also use both at the same time, effectively giving you a third reticle. You cycle through the three reticle settings using long presses of the on/off button. I'm still playing with which one to use. For slow fire, small target use, the dot seems preferable. For faster target acquisition, the circle or the circle + dot works better for me. The green reticle is more visible than a red one, so I like the color. There are two brightness settings. The lower one is the default, and could be a little dimmer for my money. A quick press on the on/off button selects the brighter setting, too bright, IMO. The single multi-function button is a little tricky to use, requiring a precise push. On the bright side, this fussiness will prevent most inadvertent button presses, so it's a wash as an issue. This sight is powered by a self-contained battery that is kept charged by some small solar cells on the rear of the optic, so you never have to worry about dead batteries.Forty-odd years ago, I was a Master class competitor in PPC contests. Unfortunately, time has taken its toll, but I'm still a decent shot (and working to improve). The optic gives me groupings of about 1/3 the size of those shot using just the iron sights. The main reason is that the optic eliminates the depth of field focus problem. The reticle and the target are both in focus at the same time, something my 75 year old eyes appreciate. It seems that every shooter at the range I use has an optical sight on their pistol; now I know why.Some people like optics with several buttons to customize the sight. I opted for the simpler solution. I'm the kind of guy who usually buys the most complex accessories, but I'm finding that I either rarely use the extra features or I can't remember the control sequences needed to invoke the fancier features. Simplicity is now my friend. The Glock is a straightforward gun to shoot. With the added tritium sights, this optic, and a Glock performance trigger, I have a reliable firearm with just the needed bells and whistles. I think I'll leave it at that, and work on my trigger pull - the only thing that would hold me back from better target groups.