Trijicon ACOG TA31 Combat Rifle Scope - 4x32 for M16 / AR15

Discover Precision with a 4×32 Magnification Scope

Trijicon ACOG TA31 Combat Rifle Scope – 4x32 for M16 / AR15 unparalleled clarity in dynamic environments, helping you engage targets faster and with unshakable confidence. Whether you’re stalking game at dawn or safeguarding a perimeter, this scope’s rugged construction and fiber optic illumination ensure you never miss a shot. Dive in to learn more in our Technical Specifications to see how this optic transforms your field performance.

Built on Proven Optic’s mission-driven values, this combat-ready scope offers free shipping and 90-day risk-free returns for worry-free purchase. Backed by 24/7 expert support, our scope’s waterproof, shock-resistant design and low-light targeting give you uncompromised reliability. Explore user Reviews or compare with other Premium Optics to experience the difference.

Serious hunters and tactical operators seeking a rugged, 4×32 magnification scope that delivers uncompromised clarity in dawn’s first light or dusk fading glow will appreciate the TA31’s fiber-optic/tritium illumination and proven combat pedigree. Outdoor Life experts noted its ability to “provide enhanced target identification and hit probability out to 800 m,” and reviewers highlighted its bomb-proof construction for field use.

Less ideal for shooters who demand variable zoom or generous eye relief—novices or budget-minded users may find the fixed 4× magnification and 1.5″ eye relief unforgiving, especially in close-quarters or rapidly changing light. Those prioritizing adjustable magnification or simple eye-box forgiveness should consider alternative LPVOs or red dots instead

Fixed 4×32 magnification scope — delivers clear, consistent target acquisition without the complexity of variable zoom, improving hit probability under stress.

Battery-free — fiber optics and tritium provide a bright aiming point in any light, so you never lose sight when it matters most.

Bullet drop compensating reticle — calibrated for .223/5.56 BDC out to 800 m, enabling precise holds and range estimation without manual adjustments.

“Both eyes open” BAC design — enhances situational awareness and speed, letting you track moving targets and maintain environmental context easily.

Rugged, shock-resistant housing — fixed-power construction with military-grade aluminum alloy withstands recoil up to .50 BMG and passes drop tests, ensuring combat-proven durability.

Multi-coated optics — maximize light transmission and minimize glare for superior clarity and contrast at dawn, dusk, or low-light scenarios

Strengths: Fixed 4×32 magnification scope offers rock-solid consistency and bomb-proof durability, surviving real-world abuse without fail.-free fiber-optic/tritium illumination ensures a bright aiming point in all conditions, while multi-coated glass delivers razor-sharp clarity.

Limitations: The 1.5″ eye relief creates an unforgiving eye box in awkward positions, and fixed 4× zoom limits flexibility for close-quarters or extended ranges. In bright sun, the reticle can be too intense, sometimes requiring manual dimming

Trijicon ACOG TA31 Combat Rifle Scope - Operators Manual

What’s the best way to zero my Trijicon ACOG TA31?
Use a throw-away shot after each adjustment and tap your mount. Confirm zero with a three-shot group at 100 yds for consistent results.

How long is the lifetime warranty, and what’s excluded?
Optical components and housing are covered for the original owner’s lifetime. Abuse-related damage is excluded.

Why does illumination fade over time?
Tritium decays with a 12-year half-life, so the glow diminishes after 10–15 years. Fiber-optic remains fully functional.

Is there horizontal parallax in this 4×32 magnification scope?
Yes. ACOG scopes are parallax-free vertically but require consistent head position to avoid horizontal shift.

How much eye relief does the TA31 offer, and is it hard to use?
It provides 1.5 in of eye relief. Users acclimate quickly with practice, though it’s less forgiving than LPVOs.

Can I replace worn illumination if my scope is out of warranty?
Yes. Trijicon offers paid tritium re-lamp services for out-of-warranty scopes via their support portal.