JT from United States, WA Public Profile

This fits the MkIII and MkIV version of the 22/45. Can turn your mags universal if you have those specific guns. I don't have the MkII 22/45, so I can't vouch for that.

The hook is great for a 2-handed grip, that's what it's designed for. For one-handed target shooting, it looks kind of funny without your extra finger, but it doesn't hurt.

After having the Sig RomeoZERO, I think I know what an sub-par direct-mount optic is like - this is a big improvement for not much more money. That being said, this optic has the freedom to be bigger.

First thing I like, the windage/elevation has big screws and click values. With the click, the screws should not walk under recoil. Because I shoot .22, I can't vouch for bigger cartridges.

second, there's 2 buttons to adjust brightness and they are on either side of the optic. easy to adjust in the heat of competition, and you really can't mess it up.

third, there is a battery hatch on top, which itself has a gasket. you can change the battery without having to re-zero the optic, and you need not fear it shorting-out in wet conditions. That said, I prefer the battery hatch on a Holosun.

Big lens, too.

3moa dot works nice on targets - it's my favorite reticle. For defense, you might prefer a 5moa dot or a big crosshair.

Only complaint: They should have put a rail adapter in the box. Then the buyer could then mount it to any handgun with a pic rail, without having to think about footprint compatibility.

The Sig Romeo Zero compares poorly to the Holosun "K", but that optic costs more than twice as much.

good: Cheap, accurate optic. The dot is visible and shoots straight. I have no reason to believe that it will let you down indoors, after sighting-in and adjusting brightness. Very adequate for practice.

worst part: Only one button for brightness settings, and it's in a bad spot. It's hard to press with your finger, and if you do, you will smudge up the lens. You realistically have to use a tool to press it. And with its single button, it will cycle up-and-down through brightness settings, but you won't know where you are. That is bad for a competition setting. If it had two buttons, you could go up/down and find your setting fast and conveniently - and you would know when you're at min/max brightness. Not the case with this optic.

2nd problem: Battery is sandwiched between the mount and the optic. You have to put tape down on the mount, so the battery won't short out. That's bad for water resistance. An outdoor competition can get wet. For indoor practice, it's not a problem.

3rd problem: windage/elevation controls use a micro hex key and there are no click values. you have to adjust by "feel". Once it's zeroed-in, it's irrelevant, but other optics have click values that correspond to MOA adjustment.

4th problem: optic is designed to mount with wide M4 screws. It includes special M3 screws with built-in spacers, so it will fit anything drilled for M3 or M4. But if the gu

Mounts just fine to Ruger MkIII.

Works flawlessly with my RMR footprint optic. Mounts close to the gun. Using one direct mount plate is straighter than using a rail and adapter. Zero-in is fast.

I expect that this works just as great with Docter/Noblex & C-More RTS, but I can't test that.

Fits poorly to RMS/RMSc. That is the most common style. This mount does not use the front or rear mounting pegs for that footprint - two screws do all the work. Bad fit. To make this mount so universal, some difficult design decisions were made.

Do NOT try to mount a Sig Romeo Zero (RMSc footprint), it's not possible. That optic needs M4 screws, but this mount has small imperial threaded screws - those screws are too narrow to fit the optic. Don't use the M3/M4 combo screws that come with the Romeo Zero - they are metric and they will cross-thread the holes and ruin the mount.

You will have to use a rail and an adapter to mount the cheap Romeo Zero.

Some problems would be solved if this mount used metric thread, but that's another difficult design decision. C-More is designed for imperial thread, and uses the same holes as RMSc. I think I would have chosen differently.