The Scope That Changed Everything. There's a reason the Trijicon ACOG® (Advanced Combat Optical Gunsight) is the official medium-distance engagement optic of the Marine Corps and U.S. Special Operations Forces.
Red Crosshair Reticle, Thumbscrew Mount, LED Illuminated.
The concept was simple; a durable scope with a reticle that illuminates in low-light and no-light situations—without requiring the use of batteries.
More than 30 years later, the original ACOG stands the test of time as one of our most popular items. Choose from many 4x32 options, including the Official Rifle Combat Optic (RCO) of the U.S. Marine Corps.
The original Trijicon ACOG® delivers unprecedented performance and durability with total user illumination control. Now with six levels of brightness, thanks to the ACOG 4x32 LED. Users can select from six adjustable brightness levels with an “off” between each setting, allowing the user to determine how much to illuminate the reticle - even in transitional lighting. Powered by a single AA battery, the LED ACOG can run for over 12,000 continuous hours (on setting #4).From the legendary ACOG® family of products, the LED ACOG is the first to offer user-selectable brightness controls. Users can select from six adjustable brightness levels with an "off" between each setting, allowing the operator to determine how much to illuminate the reticle - even in transitional lighting. Powered by a single AA battery, the LED ACOG can run for over 12,000 continuous hours (on setting #4). The body has been optimized by moving the RMR mount forward to maximize its performance in conjunction with the ACOG. Like all ACOG models, it is forged from rugged 7075-T6 aircraft-aluminum, resulting in a nearly indestructible sighting system and electronics that offer outstanding reliability. Users can select multiple bullet drop compensating and ranging reticle options. Fully night vision device compatible, the Trijicon 4x32 LED ACOG is also compatible with most other 4x32 ACOG accessories available.
Always On, Always Ready
Most ACOG® models are battery free, featuring a tritium/fiber optic illuminated reticle that automatically adjusts the brightness based on available light.
Several ACOG models are designed with a user adjustable brightness setting powered by a single AA battery. The 3.5x35 LED and 4x32 LED models both offer six adjustable brightness settings.
Rugged, Reliable Housing Design
Fixed-power design allows for minimal moving parts to create a nearly indestructible sighting system.
"Both Eyes Open" Design
“Both eyes open” shooting using The Bindon Aiming Concept (BAC) allows for improved situational awareness.
The quality of the glass and multi-coated lenses maximize light-gathering capabilities and clear field of view with zero distortion.
Exact Target Distances & Hold
Most ACOG models feature a bullet drop compensating and target-ranging reticle for decisive aiming.
No other magnified optic has been used more in combat than the ACOG.
Proven to withstand recoil from a .22LR to a .50BMG and everything in between. Easily passes U.S. Military drop test requirements.
Exceptional waterproof performance that exceeds military standards. Dry nitrogen-filled to eliminate fogging. This optic is tested to withstand and perform in extreme cold and heat with dry-nitrogen filled housing that mitigates fogging.
Length x Width x Height
6 in x 2.9 in x 2.5 in
(152.4mm x 73.66mm x 63.5mm)
18.1 oz. (513.13g)
Day Reticle Color
Night Reticle Color
Bullet Drop Compensating (BDC)
0.223 / 5.56
AA Lithium or Alkaline Battery
2 Clicks per in. @100 yards
1.5 in. (38.1mm)
0.32 in. (8.13mm)
Field of View (degrees)
Field of View (feet)
36.8 ft. @ 100 yds. (12.27m @ 100m)
Flattop Thumbscrew Mount (TA51)
- Thumbscrew Flattop Adapter (TA51)
- AA Battery
- LENSPEN (TA56)
- Lanyard Assembly for Adjuster Caps (TA71E)
- Lanyard Assembly for Battery Cap
- Trijicon Logo Sticker (PR15)
- ACOG Manual
- Warranty Card