This is a EOTech known as the XPS2, model XPS2-0GRN.
Now with an easy-to-see Green reticle" the XPS is the shortest and lightest HWS sight yet. The Green reticle is approximately 6X easier to see than red in daytime which can lead to faster target acquisition. With a single 123 lithium battery configuration" the XPS provides additional rail space" leaving more room for rear iron sights or magnifiers.
Features:
Water Resistant
Fits weaver or MIL-STD-1913 rail
Green reticle
