Nightforce COMPETITION 15-55x52mm Rifle Scope, Black - .125 MOA - CTR-1 Reticle C457 Internal Adjustments: Elev- 55MOA/15.0 MIL, Wind-50MOA/ 13.6MIL Tube Diameter: 30mm Eye Relief: 3.15" Mounting Length (inches/mm): 6.4/162 Weight (ounce/gram): 27.87/790