EOTech EXPS2-2 Holographic Sight,black Reticle is a 65MOA circle with two 1 MOA aiming dot Single transverse 123 battery to reduce sight length Shortened base only requires at most 2 3/4 inch of rail space Battery cap and latch are eliminated and replaced with a simple O-ring, tethered cap; better sealing is achieved Battery compartment is now separated from the base to allow it to hover over the delta ring of the rifle