![2girls acog american_flag bare_shoulders blue_eyes blue_hair blush breasts brown_hair bullpup dusk eating elbow_gloves food food_in_mouth g.haruka gloves ground_vehicle gun h&k_sl8 holding holding_food leotard long_hair m320 medium_breasts mk_18_carbine motor_vehicle motorcycle multiple_girls original p90 real_world_location red_eyes sarashi science_fiction sidelocks submachine_gun thighhighs washington_monument weapon rating:s score:4 post #1796674](/cdn_image/preview/8c/b7/8cb79d963967084832d9d780993c6452.jpg)
Advanced Combat Optical Gunsights (abbreviated ACOG) are a series of telescopic sights manufactured by Trijicon. The ACOG was originally designed to be used on the M16 rifle and M4 carbine, but Trijicon have also developed ACOG accessories for other firearms. Models provide fixed power magnification levels from 1.5× to 6× ACOG reticles are illuminated at night by an internal phosphor. Some versions have an additional daytime reticle illumination via a passive external fiber optic light pipe.