Trijicon ACOG 4x32 Dual Illum Red Chevron M150 TA51 Mount 100228

If you’re building a standard Army-spec M4 clone, the Trijicon ACOG 4x32 M150 (TA31RCO-M150CP) is the official choice. While it looks nearly identical to the Marine Corps A4 version, it is specifically tuned for the shorter 14.5" barrel of the carbine.

This model features the classic Red Chevron, providing a familiar, high-contrast aiming point that has been the backbone of infantry optics for decades.

The Official Army RCO

• Carbine-Specific BDC: The reticle is calibrated for the ballistic arc of the 5.56 NATO round when fired from a 14.5" M4 barrel, ensuring your holdovers are dead-on at distance.

• Red Dual-Illumination: Utilizes Trijicon's famous battery-free system—fiber optics to harvest sunlight for a glowing red reticle by day, and tritium for a constant glow at night.

• Target Acquisition: Features the Bindon Aiming Concept (BAC), allowing you to keep both eyes open for better situational awareness and lightning-fast transitions between targets.

• Indestructible Build: Forged from 7075-T6 aircraft-grade aluminum, it is waterproof to 100 meters and designed to survive the rigors of combat.

Technical Specifications

The "Clone Correct" Choice

If you are aiming for a 1:1 replica of a modern U.S. Army service rifle, this is the exact optic you need. It typically comes standard with the TA51 mount, providing a rock-solid zero that won't shift even after years of heavy use.