Nightforce NXS - 1-4x24mm - .250 MOA - FC-3G - NVD - PTL, Black, 30 mm C451 Internal Adjustments: Elev- 100MOA/27.3 MIL, Wind-100MOA/ 27.3MIL Tube Diameter: 30mm Eye Relief: 3.5" Mounting Length (inches/mm): 5.4/137 Weight (ounce/gram): 17/482