SIRIUS Multi-Reticle Red Dot Sight (RMR Pistol Cut) 3 MOA Dot & 32 MOA Circle

Pure greatness. This optic is ahead of contenders and you will definitely get a bang for your buck!

This red dot sight is impressively built and comes with a thoughtful, complete package. It includes three sets of mounting screws, each pre-coated with thread-seizing nylon, along with three different tools (including Allen keys) and a well-written manual better than most in this price range.

Operating the optic is intuitive:
* A short press on the plus (+) button wakes the unit and increases brightness.
* A long press on the plus button cycles through reticle options (dot, circle, etc.).
* Pressing on the minus (C) button reduces brightness.
* Hold the minus button to power down the unit.

I tested the shake-awake feature, and it worked perfectly. After a few minutes of inactivity, the unit powered down, and a light tap brought it back to life.
The optic includes a generously sized viewing window for its class, which helps provide a better field of view. One detail to watch for: the battery compartment is secured with tiny cap-head Allen screws. These are not captive, so be careful not to lose them during battery changes. The battery comes included in the box, but you'll need to install it yourself.
A welcome surprise the product page didn't mention it'was the inclusion of a Picatinny rail mount. This gives you flexibility: use the mount if you're installing the optic on a rifle, or remove it if you're using it with an RMR-cut pistol slide.
There were one minor disappointment. The kit includes separate tools for mounting and adjustments, unlike other makers red dots, which come with a unified multi-tool. It's a small thing, but a single all-in-one key would improve the overall user experience.
All in all, a well-designed, feature-rich red dot that feels like it punches above its price point.

Nice sight for the price. It fits perfectly.

For a lower cost option, I am pleased!

Works perfect on Mossberg 500. After 3 boxes of sabot slugs it didn’t shift.

Very reliable and has kept good zero through several rounds of use.

I own two of this - One just started to act up after 3000 rounds of 9mm on an M&P 2.0 Compact. The features are great, the glass is really nice. The battery doesn't last as long as some other red dots. I plan to test the warranty on the first unit and follow-up with this review/rating. Giving it the benefit of the doubt, so to speak, this is a really nice optic for the money.
Update: The manufacturer responded to this review right away, wishing to resolve my issue - Very cool, thanks!

Everything's so far so good. It's been holding zero and it is very similar to a lot of your high end.Red dots. I'm hoping for the best.

Installed on my RXM easily and with the RMR footprint there is no unsightly gap like there is with SMRc footprints. Nice clear optic with very well defined circle and red dot. Adjustable brightness works in any light conditions. Co-witness is perfect with the RXM. I have taken it to the range once and 180 rounds and it is still zeroed as I set it. My only minor complaint are the on/off buttons are small and easy to press both at the same time. I can work around that. So far I am very pleased.
**update** 300 rounds since installation and with a bench rest at 10 yards the gun put a 1" group into the bullseye. Still holding zero perfectly, and still working perfectly. That rubber hood they supply with this is really handy, especially when cleaning the gun, keeping chemicals off the glass and in storage dust off the glass. Even more happy now.

Super impressed with this sight. My comparison is to the Holosun 507 X2 multiple reticule sight of which I have two of. These sights were quite expensive and in my use I really don't see much difference on the range. Every feature works flawlessly right out of the box.