Trijicon 100190 ACOG 4x32mm LED Illuminated Red Crosshair .223/5.56 BDC Riflescope - Black Hardcoat Anodized

The Trijicon 100190 ACOG is a battle-proven, fixed-magnification combat optic built around a 4x32mm design and calibrated specifically for the .223/5.56 cartridge on the AR-15/M16 platform. This is the LED variant of Trijicon's iconic ACOG line, engineered to give operators rapid target identification and accurate bullet-drop compensation out to 600 meters.

The illuminated red LED crosshair .223/5.56 BDC reticle provides a crisp aiming reference calibrated for use with .223 Remington and 5.56x45mm NATO. Unlike tritium-only ACOG variants, this LED model is powered by a single AA battery and is the first in the ACOG family to offer user-selectable brightness controls. Operators can cycle through six adjustable brightness levels with an "off" position between each setting, and on setting #4 the optic runs for over 12,000 continuous hours on a single battery.

The optical system features multi-coated lenses for enhanced light transmission and clarity, while the housing is forged from 7075-T6 aircraft aluminum and finished in black hardcoat anodized for exceptional durability in the field. The ACOG is rated fogproof, shockproof, and waterproof, and is internally adjustable with 2 clicks per inch at 100 yards for precise windage and elevation corrections. The fixed 4x magnification delivers a generous 36.8 ft field of view at 100 yards with a comfortable 1.5" eye relief.

At just 6" long and 18.1 oz, the 4x32 LED ACOG is compact enough to mount on carbine-length platforms without disrupting balance, yet rugged enough for hard professional use. It is a field-proven combat optic trusted by military, law enforcement, and civilian shooters alike, and remains one of the most widely adopted fixed-magnification riflescopes ever fielded.