Nightforce Optics 5-25x56 ATACR ZeroStop Riflescope, Matte Black with F1 DigIllum Illuminated MOAR Reticle, 34mm Tube Diameter, Power Throw Lever & Side Parallax Adjust. Internal Adjustments: Elev- 89MOA/26 MIL, Wind-60MOA/ 18MIL Tube Diameter: 34mm Eye Relief: 3.54 inch Mounting Length (inches/mm): 6.3/160 Weight (ounce/gram): 30/850