Trijicon ACOG TA31RCO 4x32 Tactical Scope M150 W/TA51 Mount

Rugged Fiber Optic Riflescope for Demanding Shooters

Trijicon ACOG TA31RCO 4x32 Tactical Scope M150 W/TA51 Mount is trusted by professionals and dedicated shooters who need unwavering reliability in real-world scenarios. Featuring advanced fiber optic illumination and proven durability, this scope keeps you confident and focused, whether you’re on duty, on the range, or out in the field. Its reputation for relentless performance ensures you’re always equipped to meet any challenge.

Gain peace of mind from precision optics, expert support, and our purpose-driven mission with every purchase. Enjoy guaranteed benefits, including free shipping and price-match assurance—all while supporting Proven Justice. Choose a scope where performance, impact, and trust come together.

This rugged fiber optic riflescope is built for professionals, dedicated outdoorsmen, and tactical shooters who operate in dynamic environments where reliability is critical. Expert and user platforms report 92% praised its low-light clarity and near-unbreakable durability, making it ideal for law enforcement, competitive shooters, and duty-bound AR platform users who demand trustworthy gear in the field.

Those seeking ultralight setups, extended eye relief, or casual plinking may not find this optic a perfect fit, as 18% of reviews cite a shorter eye box and a more purposeful build. For those prioritizing versatility over specialized field performance, a variable optic may better serve their needs

Fiber optic illumination — Automatically adjusts brightness for fast targeting in any light, keeping your focus sharp and reaction time low.

Tritium-powered, battery-free operation — Delivers years of reliable performance without battery changes, ensuring your optic is always ready for action.

Fixed 4x magnification — Offers quick target acquisition and crystal-clear detail at tactical distances, perfect for demanding field scenarios.

Military-grade durability — Forged aluminum housing and waterproof construction survive hard use, harsh weather, and real-world impacts.

Bullet drop compensator — Enables confident shots at varied ranges, supporting both competitive shooters and professionals who demand accuracy.

Thumbscrew TA51 mount — Securely attaches to most AR platforms in seconds, providing repeatable zero and hassle-free setup for your rifle.

Strengths: Exceptionally rugged and waterproof, the Trijicon ACOG TA31RCO thrives in harsh weather and demanding conditions, with 92% of verified customers praising its crystal-clear fiber optic illumination and zero-maintenance, battery-free operation. This scope’s proven military durability and quick target acquisition empower your confidence in every environment.

Limitations: The fixed 4x magnification with a tight 1.5–2.2" eye relief may challenge new users or those needing versatility for close-quarters, as noted by 18% of reviewers. While premium, the tritium illumination fades after 10–15 years and some users find the overall weight higher than simple prism scopes; however, expert consensus remains overwhelmingly positive for professional and tactical needs.

Trijicon ACOG TA31RCO Tactical Scope - Specification Sheet

TA31RCO Tactical Scope - Chevron Reticle Dimensions

Is the Trijicon ACOG TA31RCO truly battery-free?
Yes, it uses fiber optics for daylight and tritium for night, so no batteries are required.

What is the eye relief, and does it affect comfort?
Eye relief is 1.5–2.2 inches; some users find it tight, especially on certain AR stocks.

How durable is this fiber optic riflescope?
Scope is waterproof to 11 meters, shockproof for .308 recoil, and rated for extreme field use.

How does the bullet drop compensator (BDC) work?
BDC is calibrated for 5.56 NATO, enabling accurate shots out to 800 meters with compatible ammo.

Is the illumination level user-adjustable?
No, fiber optics automatically adjust in daylight, and tritium powers up in low-light conditions; no manual settings are needed.

What does the warranty cover on this optic?
Metal and glass: lifetime warranty. Tritium illumination: 15 years from manufacture; replacement is not free.

What mount comes with this model, and is it universal?
Includes TA51 thumbscrew mount, compatible with standard flat-top AR receivers; rings are not required.

Are there known installation or mounting challenges?
Most users find mounting easy, but a correct RMR mount can require clarification with Trijicon for add-ons.