The American Tactical Tactical Flip Up Front/Rear Sights are a polymer backup iron sight set featuring an adjustable A2 front post with spring-loaded posi-lock design and a dual-aperture windage-adjustable rear sight for Picatinny rail platforms
For quality target acquisition, get the Leapers Accu-Sync Spring-Loaded rear sights. This flip-up sight is powered by a Posi-Lock button that automatically deploys the sight tower and prevents it from collapsing when deployed.