These molded impact-resistant polymer back up sights are affordable and dependable. Don't let the price tag fool you! This is a reliable sight set that is guaranteed to hold zero shot after shot. Skip the Amazon garbage and get something that you can rely on without breaking the bank (they are backups, after all!).
Windage and elevation adjustment doesn't need any special tools, and just like the dials used to adjust POI, the detents that secure the sights in the upright position are steel-reinforced.
For reference, overall footprint is similar to Magpul's MBUS. Mil Std 1913 spec, so it'll fit on your AR's pic rail. Might need a few love taps with a mallet depending on rail thickness. Also, please note that crossbolts are METRIC.
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These are very nice little backup sights. They seem pretty durable although I can see a really hard knock damaging them. The tool-less adjustments are awesome. They took a little effort to slide onto the rails but they're solid. One issue is that the cross bolt is threaded the entire length, so when you tighten it the threads grind against the forward rail section causing some damage. A smooth section in the center of the bolt would help prevent this issue.
Fantastic for price point, only lacking a little thumb-tab for quick flip-up.
Quality of these back up sights is spot on for the price point. Minor mold lines are present on the product, however nothing impacting function or form. The screws are cleanly done and seem solid, nothing is loose on the sight. The adjustments can be done without tools using knobs on the side. They seem to have detents that would hold them solidly zeroed. They have detents that pop them up and down under what seems to be some sort of spring, where they jump to a down and up position, making them easily deployed. They do not have a spring activation to go up like the magpul polymer types. For back up sights these are very acceptable. For the price point especially you are getting what seems to be a solid product. My only concern would be if they are able to hold zero under hard use, such as training, or some sort of event where your rifle was rubbed up against something like a car door or perhaps your vest/equipment in an event where your rifle was slung. The knobs seem like they could get caught and adjusted if just the right angle was hit, throwing off your zero. These are unfounded observations I have made as a firearms enthusiast, and have not been proven to be true. These could hold zero perfectly fine in hard use. (Which I do plan to do!) As a bonus the company seems great and very receptive to feedback, they also shipped quickly and sent me some cool stickers so that's awesome. Thanks for that guys, and thanks for the awesome sights!