Lens: 21mm

Package Include :

The Arcturus M4's packs all of those amazing internal components into a stellar package

GLOCK G17 Gen 4 CO2 Blowback Airsoft pistol brings all the features you want in an airsoft pistol to one of the most recognizable platforms on earth

WEIGHT: 6 OZ

UTG® 3.8" ITA Red/Green CQB Dot Sight with Integral Mount mounts Lens: 21mmQuick Aim Electronic Dot Sight with Red Green Dual Illumination 38mm Tube with Best in Class Emerald Lens Coating for Maximum Brightness and Clarity Consistent and Precise Coin adjustable W E Knobs with 1 2 MOA per Click Increments Clear and Sharp 4. 0 MOA Dot Optimal Brightness Settings for Variable Shooting Environment Great Field of View and Unlimited Eye Relief Includes Integral Picatinny Mounting Deck and Flip open Lens Caps