Trijicon TA31A ACOG 4×32 | Illuminated Red Triangle | 100213

The Trijicon TA31A ACOG 4×32 is a compact, internally-adjustable telescopic sight featuring a Tritium-illuminated Red Triangle Post reticle and a hardcoat anodized finish. It is designed for use with the M16 family and engineered to provide consistent aiming capability in a wide range of light conditions without reliance on batteries. The ACOG’s reticle layout balances precise distance marksmanship with quick target acquisition for practical field use. Common applications include mounting on M16-family service rifles for duty or field operations and medium-range precision shooting.

Product Specifications

• The manufacturer is Trijicon.
• The model is TA31A ACOG.
• The manufacturer’s part number is 100213.
• The magnification is 4x.
• The objective lens diameter is 32mm.
• The reticle type is Illuminated Red Triangle Post.
• The eye relief is 1.50″.
• The field of view is 36.80 ft @ 100 yds.
• The overall length is 7.30″.
• The weight is 16.20 oz.
• The optic coating is Multi-Coated.
• The device is rated Waterproof, Fogproof, Shockproof.
• The adjustable parallax value is listed as Dual Illuminated Red Triangle.
• The adjustment size is 2 Clicks per Inch @ 100 yds.
• The package includes carry handle screw and washer kit, 4×32 Scopecoat, LENSPEN, lanyard assembly for adjuster caps, Trijicon logo sticker, ACOG manual and warranty card.
• The UPC is 719307301252.

Built to deliver dependable performance in variable conditions, the TA31A pairs rugged mechanical construction with battery-free tritium illumination for low-light reliability. Its compact footprint and proven optical design make it a practical choice for shooters who need a durable, consistently performing sight for service-oriented and precision shooting tasks.