Holosun Magnifier Red Dot Sight 6x28mm Black. The HM6X is feature-packed and includes a quick release ambidextrous flip-to-side Picatinny rail mount. The 7075-aluminum housing features a removable spacer which provides compatibility with both absolute and lower 1/3 co-witness dot heights for maximum compatibility. The HM6X has a generous 2.55'' of eye relief is IP67 certified water resistant. Specifications for Holosun HM6X 6x28mm Magnifier Red Dot Sight: Manufacturer: Holosun Finish: Black Anodized Magnification: 1 x Objective Lens Diameter: 28 mm Eye Relief: 2.55 in Length: 4.3 in Weight: 11 oz Fabric/Material: 7075-T6 Aluminum Alloy Color: Black Condition: New Features of Holosun HM6X 6x28mm Magnifier Red Dot Sight Flip-to-the-side Design Compatible with Absolute and Lower 1/3 Height Optics Package Contents: Holosun HM6X 6x28mm Magnifier Red Dot Sight QD Mount Spacer Holosun HM6X: HM6X Magnifier Red Dot Sight 6x28mm Black