Upgrade your favorite Ruger Mark Series pistol with the new TandemKross Fiber Optic Front Sight Set! The upgraded sight is designed to collect surrounding light rays to offer you superb visibility, even in dark conditions. This drop in replacement unit will greatly increase your sight acquisition over the iron sights. Improve your accuracy today with the new TANDEMKROSS Front Fiber Optic Sight for the Ruger Mark Series pistols! FeaturesFeatures highly visible fiber optic light tube for quick target acquisitionMade of Aluminum for long lasting durabilityIncludes red optic tube for customization Compatible Firearms: Included T-10 torx head screw is only intended for use with the following models produced before 2019:Ruger Mark IV 22/45 LITERuger Mark III 22/45 LITE IMPORTANT: Included T-10 torx head screw size and pitch is intended for use in the front sight for supported models produced before 2019. This sight is designed for Ruger Mark III 22/45 LITE and Ruger Mark IV 22/45 LITE. Mo...