Description

The Trijicon 3×30 Compact ACOG (400373 / TA33-C-400373) is a fixed 3-power combat optic machined from a single forged aluminum housing, delivering a dual-illuminated green horseshoe/dot ballistic reticle calibrated for 5.56x45mm 62-grain loads with no batteries required. Built for AR-platform carbines and patrol rifles, it pairs generous eye relief with Bindon Aiming Concept “both eyes open” use, making it a fast, lightweight alternative to red dots with magnifiers.

Key features

• Part number: 400373 (TA33-C-400373)
• Caliber: 5.56x45mm / .223 Rem., 62-grain BDC
• Magnification: 3x fixed
• Objective: 30 mm
• Reticle: Green horseshoe with central dot, 5.56 / 62-grain BDC stadia
• Illumination: Tritium + fiber optic, battery-free
• Eye relief: 1.9 inches
• Field of view: 19.3 ft at 100 yards (3.7 degrees)
• Exit pupil: 8.4 mm
• Adjustments: 0.25 MOA per click
• Length: 6.1 inches
• Weight: about 9.8–9.9 oz (optic only)
• Housing: Forged aluminum, hard-coat anodized
• Mount: Compact ACOG mount / Q-LOC-type Picatinny mount (varies by kit)
• Waterproof and fogproof; multi-coated glass

Special characteristics

• Dual-illumination system keeps the green horseshoe/dot reticle daylight-bright via fiber optics and self-lit in low light via tritium, eliminating batteries entirely.
• The 5.56 / 62-grain BDC stadia give rapid holdovers from close range out to extended carbine distances without dialing turrets, ideal for duty and defensive use.
• Long, forgiving eye relief and compact size support true “both eyes open” shooting, combining red-dot-like speed with 3x target clarity.