The Arisaka EOTECH EXPS Mount Mk2 is designed for the EOTECH EXPS3 and EXPS2 holographic weapon sights. The OEM mount has a centerline optic height of 1.725″, making it impossible to align at 1.93″ or requiring the use of a riser to get to 2.26″. The Arisaka Mk2 mount completely replaces the OEM mount, alleviating the need to use a riser, saving weight, and providing a 2.26″ optic centerline height.