The HM3X is An Aluminum bodied 3X magnifier that includes a quick release, ambidextrous, flip-to-side mount with Absolute and Lower 1/3 Co-witness mounting solutions. Additional features include 2.75" of eye relief, IP67 certified water resistance, with windage and elevation adjustment for precision zeroing. In the Box: Quick Release Mount T10 L Key User Manual Features of the Holosun HM3X Flip-to-the-side Design Outstanding Specification and Clarity QD Mount and Spacer Included IP67 Waterproof