https://midstatefirearms.com/product/polymer-flip-up-back-up-sights/

shipping available

Polymer flip up sights, easy to install, mounts to picatinny rail. These back-up sights easily fold down out of the way. They are spring-loaded and easy to flip up when you need them. Adjustable windage and elevation.

*note, every now and then a set of these has a bad screw.  We will gladly replace it if this occurs*