Ade Advanced OpticsRD3-023 Shake Wake Valkyrie 4 MOA GREEN Dot Sight for Optics Ready Pistol That is Compatible with RMR fooprint Optics Such as Holosun HS407C/HS507C/HS507T and Riton X3 Tactix PRD.…

Perfect fit, seems durable and easy to operate. Multiple intensities work well. Shake awake feature is worth the price alone.

It holds zero but because it doesn't sit flush the redical moves when you screw it in so I wouldn't recommend mounting it on a slide that doesn't have the front supports

It was exactly as advertised, green laser and low profile. The price is excellent

Was defective when arrived, company promptly refunded my money. No regrets for ordering from them.

So far good red dot did not fit the pistol I bought it for, even though it said it would. I came back and paid for an adapter, still didn't fit. I'm pretty sure I saw Shake awake on the description that did not work it just stayed on until I turned it off

The green dot RD3-023 (4 MOA Dot) is very easy to mount if you have an RMR footprint mounting plate. *BUT* there is a serious design flaw on the sight, and others have made mention of it, too. In order to zero the sight, you have to loosen the two locking screws found at the heel of the base before you turn the elevation or windage adjusting screws. The RMR mounting plate (in my case on FN 502) has a fixed "iron" rear sight that covers both of the lock screws. So after installing the sight, and finding that I need to zero it, I have to remove the sight, loosen the lock screws, remount the sight, zero the sight, remove the sight, tighten the lock screws, reinstall the sight, pray that it remains zeroed, etc. This could be something that needs to be done more than once, depending on how well it holds zero during removing and remounting. And since the battery is under the sight, replacement *could* force a repeat of this "process."Otherwise, it's a solid little unit with 5 visible brightness levels (it has 6 levels but one is only visible with night vision), shake awake, and it can handle recoil up to 45 ACP. If they fixed the design issues above, this would be one of the best values on the market.I'm not sure if I would buy it again because I have not done the zeroing project above, and if that is straightforward, I could recommend it. Or, you can blow another $100 - $200 buying a "better" unit. I'll try to update this report after I finish zeroing and remounting the sight.

This sight did not hold up well whatsoever in my use. There was no abuse or anything out of the ordinary. I used it once and the button to turn it on broke. Sight felt decent, not great but better than some. Shame it broke so easily.

Rear locking screws are a poor design for two reasons. You have to remove sight to keep rear suppressor sight mounted. That causes loss of zero. You would have to completely remove rear iron sights which in my case are tritium suppressor height. Between having to try zeroing and also having to press in rear sight or remove red dot, I've given up. When mounted wouldn't hold zero from one session to another. Optical clarity isn't very good; not clear enough with almost a fish eye effect. Battery installs on bottom of sight. Cost is the only plus.