FeyachiS37 Fiber Optic Iron Sights,Red Green Dots Flip Up Sights Backup Sights for Picatinny Rail,Tool-Free Adjustment Front and Rear Backup Iron Sight

No spring assist, but still work great.

These work perfect on my AR, very happy they stay nice and tight on the pic rail.

These are okay but not great. I do not see them lasting a very long time but they are cheap and will get the job done.

these fiber optics are outstanding in low light conditions. simple to install and adjust. Not a single complaint. two of my buddies want the same ones after they saw mine.

I ordered these out of curiosity because I kept seeing Feyachi brand items on Amazon for good prices. They fit well on a rail and hold securely. As a flip up sight, they are quick and easily raise up. The sights are quick to see through and adjust. I do like the green and red highlight on them but I’m not really sure that it helps with quicker target acquisition. Not sure how much other Feyachi equipment I’ll order in the future but I am impressed with these.

I got these for my 2nd rifle to replace the OEM iron sights to get out of the way of my optic.On the plus side, they're sturdy, the adjustment knobs are stiff and hold zero well as far as I can tell, and work pretty well as iron sights. I don't shoot beyond 100y with iron sights with this gun as it isn't meant for that, so I can't say too much about accuracy - if any sight doesn't work out to 100y it shouldn't be on your gun.The downside - The biggest problem is deployment. My Magpul BUIS are spring loaded and can be deployed with one finger pressing down on the button. These are not spring loaded and require you to press the pin in and pinch the sights and pull them into position, tying up two hands for a bit and taking your attention away from your target. Since BUIS are usually designed to be deployed when your primary sight/optic fails, time is usually of the essence. Now to be fair, the description does say that they aren't spring loaded, but I hoped they'd be quicker to deploy.The fiber optic dots aren't as good as I hoped, but that is something my Magpuls don't have, so there's a plus there.Overall for the money these are pretty good, but I won't be replacing my Magpuls on my primary rifle with these due to the time it takes to pop them up.

These are really well made. The front and rear sights both have a pin that when you flip them up they lock up. The pin has to be pressed in to lay them back down. The red dot on the front site is quite visible. The rear site has a small peep hole and when you flip it down the green dots are highly visible with the larger peep. The clicks are positive both for windage and elevation. They came in a small case that holds them tightly in place with no rattle. All in all I am very impressed. These are better than the factory sights that came on my rifle.

As the heading says, this is well made as far as thickness of materials, construction, function of the spring pop-up, etc.. With all that, it is very chunky. The pop-up sections have some crisp edges, and with that tight spring I get a little flinchy when I actuate them. The fiber optic is there, but it is a very narrow strand and doesn't grab much light. Mostly they look like iron sights while in use. I ended up putting these on a shotgun and the rail clamps have proven to be remain tight over the course of several dozen rounds.