ACOG 3.5x35 w/Red Dual Illumination Donut ReticleManufacture ID: TA11ACOG 3.5x35 Scope with Red Donut BAC Reticle Features Dual Illumination (Fiber Optic provides daylight illumination and tritium illuminates reticle at night) and Ranging out to 800 Meters for 5.56 (.223 cal) see Reticle diagram Specifications:Magnification 3.5 Objective size 3.5Bullet Drop Compensator Yes Length (in) 8.00 Weight (oz) 14.00 Illumination source Fiber Optics/Tritium Reticle Pattern Donut Day Reticle Color Red Night Reticle Color Red Calibration 0.223 Bindon Aiming Concept Yes Eye Relief (in) 2.40 Exit Pupil (mm) 10.00 Field of View ( ) 5.50 Field of View @ 100yrds (ft) 28.90 Adjustment @ 100 yds (clicks/in) 4 Tube Size N/A Mount N/A Mount On/Comes With Carry Handle Housing Material Forged Aluminum