Standarized by the DEA, ATF, and FBI HRT, the Model 552 from EOTech offers Night Vision-compatability. The AA battery model is the sight of choice byt military units lik Stryker Brigade, 10th Mountain and 3rd Infantry. It is batle-proven to withstand the abuse that any harsh environment, high-powered weapon platform, or military mission can dish out. Mounts to a Weaver or MIL-STD 1913 rail. Includes 30 brightness settings with 10 for Night Vision use. Accepts 2 AA batteries and has a runtime of 1,000 hours (lithium) or 600 hours with AA alkaline batteries at brightness setting 12. XR308 Ballistic Reticle is calibrated for use with .308 Cal. 150gr M59 FMJ ammunition traveling at roughly 2, Mfg: Eotech