This super-low profile FFS Folding Up Front Sight fits a Picatinny rail and features a toolless adjustable center post for elevation surrounded by two guide posts to assist in focusing. No tool required to adjust for elevation. Elevation click adjustable from firing position. Spring loaded push-button raises the sight. Side operating to accommodate both left/right handed users. Rugged flip-up mechanism is designed to ensure constant battery action and repeat zero. No gunsmithing required to install or remove. Lifetime warranty.