Feyachi M40 3X Red Dot Magnifier with Flip to Side Mount, Focus Adjustment, Windage & Elevation Adjustable, 37/40MM Height

Works perfectly in back of my Sig Romeo red dot that I have on an AR pistol. I'm not sure why others had issues but on mine the red dot looked sharp and clear through the magnifier. It seems very sturdy. So far no issues using it at the range. Those others must have had astigmatism that makes the red dot splashy looking to the eye. That was then probably made worse using the magnifier.

If you don't mind being right up on your sight... it worked great. 2-3 clusters 50yds out. However I don't like having to keep my face as close as I needed to for this one.

Seems to be a good affordable optic. With the included spacer it lines up with the Strikefire II.I havn't measured the eye relief, but the 2.4 inches listed seems about right.It is a little heavier than expected, but i think that's probably a good thing for durability.Have not shot yet, but unless something crazy happens I'm pleased with the purchase.

The media could not be loaded. It broke. Normal use, mounted on top of a 15 pic rail behind a red dot. I never even USED the flip out feature until last night (date is irrelevant, just noting review was written the next day), I flipped it out of the way to sight in some irons. Won't stay closed. Watch the video if you'd like, sorry it's dark. Next time, I'll go SIG or Vortex. Buy once cry once after all.EDIT: It's the next day. I took the magnifier apart and I figured out what happened. The pushbutton part has a rear face that the pushbutton shaft screws into (the one in the image above), holding & closing off all of the pieces within the tubular housing of the pic adapter. I removed that piece and noticed that there was a keyed slot on both the pushbutton shaft and the housing of the pic rail fastener. Lo-and-behold, the key was gone. If you look at the face of the rear piece I spoke of, it has two holes on it that happen to be the same diameter as the keyway slot. I think that plate loosened a bit and the key slipped through that hole somehow. I used a small piece of metal wire (10 or 11 mm long, don't know it's gauge, basically a hardened paperclip is what it reminded me of) and created a new, slightly larger diameter key. I filed it down until the rear plate could only rotate if I forced it forward after placing it through one of those holes on the plate. I tightened up the rear face and put one small drop (like, seriously, a tiny drop) of red Lok-Tite on the threads. Put it all back together and it works just fine again.Sucks this happened, but honestly, it's a solid magnifier when it's not broken! I have almost 3" of eye relief while I use it and it looks pretty clear. I'm sure a Vortex looks better, but this one fits the bill. Anyways, if that happens to you, just open it up and create a new key out of a paperclip or something similar. Works great.

Great quality and well made. The perfect partner for your red dot.

I have several Feaychi products. I've been very pleased with them especially at their price level. This is a good magnifier but the mount broke after two uses. Buying a new mount costs almost as much as replacing the whole thing. If the first mount broke so quickly it's a risk that the second one will too. Therefore I do not recommend this product.

My kid put this on his airsoft AR platform rifle. It is amazingly clear and brings things into focus! I'm going to say robust enough for a .22LR-maybe a .223/5.56

This is “alright” magnifier if you are shooting on a stand or sitting down.Eye Relief is your enemy on this one. 2” inch is bad. Meaning you really have to get so close to see a good sight picture. If you are looking to get one for Airsoft, sure this is yours. For Combat or shooting targets on the move, STAY AWAY!Get something that says Unlimited Eye Relief like an EOTech. Spend that extra $400.