Sig Sauer SOR01300 Romeo Zero Reflex Sight, 3 MOA Red Dot, Black, One Size

I have been a Gunsmith for 44 years and have mounted more RMR type sights than I can remember. The Sig ROMEOzero was very straight forward in its mounting. It was mounted on a Glock 27, .40 S&W utilizing a dovetail mounting plate. The majority of these sights are metal but the ROMEOzero is a polymer housing. This particular mounting was for my personal EDC firearm and I can honestly say I have mounted more different brands than I can remember. I chose the Sig because I wanted a sight that was small but still presented an excellent sight picture. The instructions from Sig were well written and would serve a shooter who has never mounted this type of sight. Of note and great importance is the warning of not to over tighten he mounting screws because it could deform the polymer and cause the sight to malfunction. My first observations were the automatic waking of the sight with the slightest movement. Yes, this is going to cause the sight to be on with the daily movements but off whenever the firearm is still. The presentation of the red dot is very impressive when bringing the firearm up to the shooting position. I found that I needed to bring the intensity of the red dot down to mid level of brightness. Doing so gave excellent presentation in bright sunlight as well as total darkness. I urge the shooter to experiment with this to find what works best for them. Range time revealed the need for sight adjustment. Shooting at a 7 yard distance I fount he elevation to be perfect but I did need to adjust windage to the right. The adjustment screws are well defined with arrows indicating direction of travel. They are also pronounced with a solid felt click for each moment of travel. After adjustments over 50 rounds were fired with the sight holding perfectly. All screws were checked for problems and none found. I am also an NRA pistol instructor and Training Counselor and would urge anyone to consider this sight or one like it for defensive shooting. It gives the shooter faster sight acquisition and far better grouping than standard “iron sights”. Lastly I paid for this and have not been compensated in any way. Be SAFE…..Shoot WELL

Awesome quality! Beyond pleased.

Nice dot but would agree with others on the design issues. Button to change brightness settings is in a strange spot. I don’t mind this as much because I plan to leave it on the setting it’s at. The more notable flaw is having to take the whole sight off to change battery meaning you have to zero it in again. Now the positives: sig made this specifically for the p365xl. It fits like a glove and was easy to mount. Straight out of the box it I barely needed to adjust windage/elevation. It was on point! Overall great dot. If the battery changing weren’t idiotic, this would get 5 stars.

I put this on a S&W M&P Shield 9 EZ and have used it for 3 months now. It required a separate dove-tail plate adapter (not included here, in fact not even found on Amazon last time I checked). If you didn't know, you need to zero any sight you buy. Do not trust it to be perfectly zeroed from the factory. Mine was waaaay off out-of-box. The windage and elevation screws can be tight at times, so gently use the included hex tool to adjust. I was able to significantly scratch the inside where you look through, the view-port, within a couple days. I don't know from what, I don't blame the product - but just know that it's NOT scratch proof. Surprising the more exposed side, the side you don't look through, is unscratched after 3 months. The view-port also gets easily smudged with dust and oil. Cleaning it requires a soft-cloth and a thin tool in order to reach the edges with the cloth. The button to adjust brightness is NOT easily accessible. It is horribly deep near the actual view-port glass, and you have to press it pretty hard to cycle the brightness. I wish the button was on the sides or back. The red dot itself has perfect low to high brightness, no issue there. It claims to have "motion-detection" which I have observed is true, but sometimes it doesn't turn off as expected. I've put my firearm down on a table for a day, and came back to see that the red dot was still on. I've also observed that the dot does turn off after awhile. So it just seems to be finnicky. Installation was simple. Comes with various screws. Overall decent purchase, does its job, but pretty pricey when it has a handful of issues. 3 stars because of this. Would be 4 stars if it wasn't so expensive, because it's still very functional even with my issues. Edit after 6 months of use: The motion-detection feature seems to completely not work. Perhaps it's detecting the miniscule motions of the Earth, because it just doesn't seem to turn off when inactive. I've put it down in multiple different locations of my house, and the dot stays on several hours after. The battery has already died after 6 months, so I'll need to throw the irons on until I can pickup a new battery. Disappointing, as the motion-detection was the most important feature I wanted.

Edit: I'll leave the original review below, but this is a critical update that might help other idiots like myself: There's a small button on the inside of the shroud that resets the reticle, and adjusts the brightness. I mashed that little guy a couple times and we're back in business. Time will tell if this new battery (the old one was indeed dead) will last long enough to be trustworthy for a carry/nightstand weapon. I installed this on a p365, fired 39 shots, and left it in a vault for about a year. Took it out recently, no illumination- ok, battery must be dead, even though it hasn't moved this whole time and the auto-off feature would suggest total run-time is a couple hours, not the 20,000 Sig claims it'll last. Replaced the battery, nothing. No illumination, no obvious reasons for it not to be functioning. Contact terminals are clean, no sign of corrosion, rust, or other damage. I'm an unapologetic Sig fanboy but I could never recommend this optic for any redeeming qualities.