The EOTech OPMOD EXPS 3 Holographic Red Dot Sight is the ultimate sight for those who need to acquire targets quickly in short to medium ranges. Engineered with special ops professionals, these Holographic Red Dot Sights developed by ATN and OPMOD are waterproof, fogproof, and thrive in any tactical environment. The EOTech OPMOD EXPS 3 Holographic Red Dot Sight features a shortened base that only requires 2.75 inches of rail space, so it fits neatly on even short rifles and pistols.