UTG's 4x20mm AR-15 type illuminated range estimating scope mounts to any standard AR-15/M16/M4 carry handle and provides a switchable green or red reticle illumination.  

Detail Information:
•  One-piece Outer Tube with Integral Carry Handle See-thru Mount for Maximum Strength, Completely Sealed and Nitrogen Filled, Shockproof, Fogproof and Rainproof
•  Built-in Bullet Drop Compensator (BDC) for 100 to 500 Meters Usage of .223 or 5.56 NATO ROUND
•  Mil-Dot Range Estimating Reticle with High Quality RGB Side Wheel Illumination for Clear Twilight Vision
•  Superior Quality Precision Lens Elements
•  Aircraft-grade Aluminum Tube with Scratch Resistant Hard-coat Anodized Black Matte Finish
•  Complete with High Quality Picatinny/Weaver Flat-top Adaptor and Flip-open Lens Caps 
 

Magnification: 4X Tube Diameter: Other Objective Diameter: 20mm Field of View @ 100 yards: 28.0' Eye Relief: 3.3" Exit Pupil: 6.0mm Click Value @100 yards: 1/4" Length: 177mm Weight: 11.3 oz Parallax Setting: 100 Yds Batteries: CR1620 3V

A: 176mm B: N/A C: N/A D: N/A E: 69mm F: 41mm G: 33.71mm H: 33.81mm I: N/A