Standardized by the DEA, ATF, and FBI SWAT, the Model 552 is by far the most popular HWS model. This NV compatible, AA battery model is the sight of choice by military units like Stryker Brigade, 10th Mountain, and 3rd Infantry. It is battle proven to withstand the abuse that any harsh environment, high powered weapon platform, or military mission can dish out. Compatible with Gen I-IV Night Vision Systems (Tandem Operation). AA Battery model (supports Lithium and Alkaline). 65 MOA ring/1 MOA dot reticle includes rugged aluminum hood assembly and knobbed, tool-less mounting bolt interfaces to standard 1\" Weaver dovetail / Picatinny rail.