ACOG 4x32 Scope with Yellow Center Illumination for M4A1 - includes Flat Top Adapter, Backup Iron Sights and Dust Cover. The TA01NSN was designed specifically for the US Special Operations Command SOPMOD M4 Carbine. To meet their requirements, the reticle bullet drop compensator and range finding stadia lines are based on the trajectory of the 62 grain bullet from a 16 inch barrel, flattop mount (Picatinny rail Mil.Std.1913). Specifications: Magnification 4 Objective Size 32 Bullet Drop Compensator Yes Length (in) 5.80 Weight (oz) 9.9 w/o mount Illumination_source Tritium Reticle_Pattern Crosshair Day_Reticle_Color Black Night_Reticle_Color Center amber Calibration 0.223 Bindon Aiming Concept Y Eye Relief (in) 1.50 Exit Pupil (mm) 8.00 Field of View (°) 7.00 Field of View @ 100yrds (ft) 36.80 Adjustment @ 100 yds (clicks/in) 3 Tube Size N/A Mount TA51 Mount On/Comes With Flattop Housing Material Forged Aluminum Special Order No