Trijicon ACOG TA31 4x32 Combat Scope with 3.25 MOA RMR

Tactical Rifle Scope That Transforms Your Field Performance

Trijicon ACOG TA31 4x32 Combat Scope with 3.25 MOA RMR delivers combat-proven precision when critical moments demand unwavering accuracy. This waterproof tactical scope eliminates uncertainty with revolutionary dual-illumination technology that automatically adjusts between fiber-optic daylight brightness and tritium nighttime visibility, eliminating the need for batteries.

At Proven Optic, we support serious professionals who demand uncompromising performance - this waterproof tactical scope embodies our precision values through combat-tested construction and nitrogen-purged housing that exceeds military standards

Ideal for experienced professionals, military veterans, and serious tactical enthusiasts who demand uncompromising durability. This waterproof tactical scope excels for those with proper shooting fundamentals and dedication to master its precise 1.5-inch eye relief requirements.

Not recommended for beginners unfamiliar with fixed magnification and strict eye-relief requirements. New shooters may struggle with the challenging eyebox, requiring consistent positioning. Budget-conscious or casual users should consider alternatives.

Dual-Illumination System — Battery-free tritium and fiber optic technology automatically adjusts reticle brightness from complete darkness to bright daylight, ensuring your waterproof tactical scope remains always ready for critical engagements without relying on batteries.

Combat-Proven Durability — Forged from aircraft-grade 7075-T6 aluminum with over one million ACOGs battle-tested by U.S. Marines and Special Operations Forces, this tactical rifle scope 4x32 withstands recoil from .22LR to .50BMG while exceeding military waterproof standards.

Bindon Aiming Concept (BAC) — Revolutionary, both-eyes-open shooting capability enhances situational awareness and enables rapid target acquisition at close quarters while maintaining the precision advantages of fixed 4x magnification.

Multi-Coated Precision Glass — Superior optical clarity with zero distortion through premium multi-coated lenses that maximize light transmission and deliver exceptional image quality in all lighting conditions.

Integrated RMR Type 2 Red Dot — Dual 4x magnification for medium-range precision with a 3.25 MOA red dot for instant close-quarters target acquisition, providing complete tactical capability in one waterproof tactical scope system.

Shock-Resistant Construction — Nitrogen-purged housing eliminates fogging while being effortlessly and passing U.S. Military drop test requirements, making this tactical rifle scope 4x32 configuration nearly indestructible under extreme field conditions.

Strengths: The ACOG 4x32 delivers exceptional combat-proven durability exceeding military standards, with over one million units battle-tested without failure. Superior multi-coated glass clarity and a 36.8-foot field of view surpass most LPVOs in its price range.

Limitations: The restrictive 1.5-inch eye relief creates an unforgiving eyebox that requires consistent positioning, and many users experience recoil. Fixed 4x magnification limits close-quarters versatility under 25 yards compared to variable alternatives

Trijicon ACOG 4x32 BAC Combat Scope - Specification Sheet

Tactical Rifle Scope 4x32 with RMR - RMR Specification Sheet

What's the eye relief on the ACOG, and why is it so short?
The TA31 has 1.5" eye relief designed for military nose-to-handle shooting stance. This waterproof tactical scope requires consistent cheek weld positioning, but it allows for a proper sight picture when mounted correctly.

How long does the tritium illumination last before replacement?
Tritium illumination is warranted for 15 years from the date of manufacture on dual-illumination models. After this period, Trijicon offers age and condition.

Is the ACOG waterproof, and to what depth?
Yes, this tactical rifle scope 4x32 is waterproof to 66 feet (20 meters) and exceeds military waterproof standards. The nitrogen-purged housing eliminates fogging and maintains performance in extreme conditions.

Will this ACOG work with my AR-15, equipped with iron sights?
The ACOG mounts easily on AR-15/M4 flattop receivers using the included TA51 thumbscrew mount. You can co-witness with backup iron sights at lower 1/3 height with standard front sight posts.

How long is the RMR Type 2 battery life?
The 3.25 MOA RMR runs continuously for approximately 4+ years on a single CR2032 battery, featuring battery-free dual illumination, featuring fiber optic technology for daylight and tritium illumination, and automatic brightness adjustment. The 16.5-hour auto mode reset helps preserve battery life during extended use.

Does the ACOG require batteries for the main reticle?
No, this waterproof tactical scope utilizes battery-free dual illuination, featuring fiber optic technology for daylight and tritium illumination for low-light conditions. The reticle automatically adjusts its brightness based on ambient light, eliminating the need for electronic adjustments.

What's the warranty coverage for used ACOGs?
Trijicon offers a limited lifetime warranty on optical systems for the original owner only. Non-original owners may receive repair services for reasonable fees, with many customers reporting excellent customer service regardless of ownership status.

How do I know if my ACOG is genuine?
Authentic Trijicon ACOGs feature the Trijicon logo, serial numbers, and come with original packaging including TA51 mount, LensPen, warranty card, and manual. Contact Trijicon customer service to verify authenticity by serial number.a