The MPS1-FO is a fully adjustable, low profile, Rear Fiber Optic sight which easily fits the standard Novak Compatible OEM style dovetail which is the most common for most Rock Island Armory(RIA), H&K, Jericho, Striker, several Smith & Wessons, and many Imported handguns. The base Dimensions are .455” at the base and .075” deep, the widest width is double angled for ease of fitting if needed. This sight is and Extremely low profile sight with an overall height of .375” and the blade height above slide is only .250”. This sight will work with most original factory front sights or combine with optional front sights to create your favorite sight combination. Hardened “micro-click” adjustment screws give smooth and accurate match/target adjustment for both windage and elevation. This sight is manufactured to the industry’s highest standards of quality and is machined from solid bar-stock steel using state-of-the-art CNC manufacturing processes. Made in the USA. Professional grade gunsmithing parts. These are Top Quality Fusion Professional Series Parts; Made from the best materials and processes available in today's market.