Rugged, flip-up sights provide failsafe backup when your primary optic or red dot sight fails. Sight body flips up easily when you need it and locks securely in place under powerful spring pressure and two locking detent balls, so it can't be accidentally bumped down until you hit the spring-loaded button on the left side of the base to retract it. Base clamps securely to any military or commercial Picatinny rail using a standard flathead screwdriver. No protruding knobs or levers to catch on brush, clothing, or other equipment. Sturdy, protective "ears" shield posts and apertures from impact. HK-Style Rear - two same-plane apertures: large .190" aperture provides a Mfg: Troy Industries SPECS: Rear - Stainless steel and aluminum, Black or Dark Earth finish. Rear Sights - All models 1.17" (3cm) long, 1.25" (3.2cm) wide, 1.85" (4.7cm) high extended. 1.8 oz. (52g) wt. Front - Stainless steel and aluminum, Black or Dark Earth finish. M4/M16-Style Front &nda