Colt Optics C3X-1 3x Magnifier Black. Flip it in for positive target identification at distance flip it out for unmagnified close-quarters work all while holding optical clarity and integrity under recoil. It pairs a large 7.5-degree field of view with a forgiving 75-85 mm eye relief in a remarkably compact body just 69 mm (2.72 in) long and 175 grams (6.1 oz). A flip-to-side mount configurable for left or right deployment and an adjustable diopter let you set it up exactly the way you run. Specifications for Colt Optics C3X-1 3x Magnifier: Manufacturer: Colt Optics Magnification: 3 x Eye Relief: 75 - 85 mm Fabric/Material: Aluminum Package Contents: Colt Optics C3X-1 3x Magnifier Colt Optics M3X-101: C3X-1 3x Magnifier Black