Vortex Crossfire 1x21mm Reflex Red Dot Sight 2 MOA Green Black. The Crossfire is a no-nonsense sight for darn near any application and when your AR-15 or rimfire needs a simple point of aim and none of the frills the Crossfire should be at the top of your list. The 2 MOA dot is quick to acquire in close-quarters while remaining fine enough to promote pin-point accuracy at extended range. Specifications for Vortex Crossfire 1x21mm Reflex Red Dot Sight: Manufacturer: Vortex Magnification: 1 x Objective Lens Diameter: 21 mm Reticle: 2 MOA Illumination Type: LED Eye Relief: Unlimited Adjustment Click Value: 1 MOA Parallax: Free Optical Coating: Fully Multi-Coated Battery Type: CR2032 Battery Life: 50000 hours Water Resistance Level: Waterproof Shockproof: Yes Fogproof: Yes Length: 2.5 in Weight: 4.59 oz Red Dot Sights-Footprint: RMSc Lens Type: Spherical Features of Vortex Crossfire 1x21mm Reflex Red Dot Sight: Night-Vision Compatibility. 2 night-vision compatible illumination settings. Height Mount System. Lower 1/3 Co-Witness Mount and Low Mount. Fully Multi-Coated Lenses. Anti-reflective coatings on all air-to-glass surfaces provide increased light transmission for greater clarity and low-light performance. Nitrogen Purged. Gas purged and O-ring sealed for fogproof and waterproof performance. Waterproof. Designed to withstand harsh weather conditions. Fogproof. Designed to withstand a wide range of temperatures. Shockproof. Designed to withstand impact. 2 MOA DOT. The daylight bright red dot is easy to see and paints targets regardless of lighting conditions or background. Package Contents: Vortex Crossfire 1x21mm Reflex Red Dot Sight Rubber Cover CR2032 Battery Torx T-10 Wrench Lower 1/3 Co-Witness Mount Low Mount Vortex CF-GD2: Crossfire 1x21mm Reflex Red Dot Sight 2 MOA Green Black