Trijicon ACOG TA31RCO 4x32 USMC Rifle Combat Optic

The Gold Standard in Combat Optics

The Trijicon ACOG TA31RCO represents the pinnacle of combat optical design—a scope trusted by the United States Marine Corps and professional shooters worldwide. This is not a compromise optic; it is purpose-built for the M4 and M4A1 carbine platform with a 14.5-inch barrel.

Illumination Without Batteries

The TA31RCO employs a hybrid illumination system combining fiber optics and self-luminous tritium. During daylight, the fiber optic element automatically adjusts reticle brightness to match ambient light conditions. In darkness, tritium provides a glowing aiming point without requiring batteries or external power. This dual-source design ensures your reticle is always visible—from bright sunlight to total darkness.

Precision and Speed Combined

• 4x magnification for rapid target acquisition at close range
• 32mm objective for excellent light gathering and field of view
• Red chevron reticle designed for quick sight picture and intuitive aiming
• Bullet Drop Compensator calibrated to 800 meters for extended-range accuracy
• Fixed power eliminates parallax concerns and provides rock-solid reliability

Built for the Profession

External windage and elevation adjusters require no tools—critical when seconds matter. Integrated mounting bosses allow the addition of a Trijicon RMR for close-quarters backup aiming. The scope ships with a flattop adapter, carry-handle thumbscrew, anti-reflection device, protective Scopecoat, lens cleaning pen, and adjuster cap lanyard.

Durability You Can Count On

Black hardcoat anodized finish withstands the rigors of professional use. The TA31RCO is waterproof, shockproof, and built to military specifications. This is an optic that will outlast the rifle it's mounted on.