The EXPS has seen extensive use worldwide as the close-quarters optic of choice by numerous military, police, and special forces units. EOTECH'S HWS (Holographic Weapon Sight) optics utilize holographic technology to greatly reduce parallax when acquiring an off-center sight picture, allowing for a point of impact closer to the sighted-in point of aim. The compact size allows for a lower overall weight while also opening up mounting options to more compact PDW-style firearms. The optic features 20 visible settings and 10 infrared settings for use with night vision optics. The EXPS3-4 features sideloading buttons with a QD mounting device for 1913 Picatinny rails. The reticle comes with a 68 MOA speed ring that is paired with four 1 MOA dots designed for extreme long range shooting with .223 caliber rifles. This model features an all-black finish and a lower 1/3rd co-witness mount on a standard 1913 Picatinny rail. It is compatible with CR123 batteries and sports a 1000-hour life on high settings. One battery is included.