Trijicon ACOG 3.5x35 Rifle Scope, M249 Green Horseshoe/Dot Reticle, Matte Finish, Includes TA51 Mount & ARD

The Trijicon ACOG 3.5x35 rifle scope is a fixed-power combat optic built to perform across lighting conditions from bright daylight to near-total darkness. Originally developed for military and law enforcement use, this 3.5x magnification scope has become a trusted choice for shooters who need a rugged, reliable optic that doesn't demand batteries to keep working. The M249 variant is purpose-built for the M249 light machine gun platform, but its durability and optical quality appeal to competitive shooters and serious civilians running AR platforms and other rifles where a compact, durable scope makes sense.

What sets the ACOG apart is its dual-illumination system: fiber-optic elements that automatically adjust reticle brightness in daylight, paired with self-luminous tritium that glows in darkness without any external power. The green horseshoe/dot reticle is designed for both precision work and speed—the relationship between the dot and horseshoe helps with range estimation and speed of acquisition. The scope includes a bullet drop compensator calibrated for the M249 platform, extending effective targeting out to 1000 meters. The aluminum housing is built to absorb punishment in the field, and the matte finish resists glare.

This package arrives ready to mount: it includes the TA51 Flat Top mount for Picatinny rails and the ARD (Anti-Reflection Device) objective lens insert, which improves light transmission and reduces glint. The dual-illumination design lets you shoot with both eyes open, maintaining situational awareness while you're focused on the target. If you need to layer on additional optics for close work, the eyepiece housing includes threaded bosses to accept a micro red dot like the Trijicon RMR.

Key Features

• Fixed 3.5x magnification with 35mm objective lens for compact profile and light weight
• Dual-illumination reticle: fiber-optic auto-brightness in daylight, tritium glow in darkness—no batteries required
• Green horseshoe/dot reticle pattern for rapid target acquisition and range estimation
• Bullet drop compensator calibrated for M249 and suitable to 1000 meters
• Rugged aluminum alloy housing, matte finish to reduce glare
• Threaded eyepiece bosses for mounting accessory optics (RMR, etc.)
• Includes TA51 Picatinny mount and ARD objective lens insert
• Both-eyes-open design preserves situational awareness

Specifications

Frequently Asked Questions

What rifles and weapons systems is this ACOG designed for?

The Trijicon ACOG 3.5x35 M249 variant is specifically engineered for the M249 light machine gun platform. However, its TA51 Flat Top mount is compatible with any Picatinny rail, so it can be mounted on AR-15s, AR-10s, and other tactical rifles that accept standard Picatinny optics mounts.

Does the reticle require batteries or external power?

No. The ACOG uses a dual-illumination system combining fiber optics and tritium. Fiber optics automatically adjust the reticle brightness during the day based on ambient light, and self-luminous tritium provides illumination in darkness without any battery, electronics, or external power source.

What comes in the box with this scope?

The package includes the Trijicon ACOG 3.5x35 rifle scope, the TA51 Flat Top mount for Picatinny rails, and the ARD (Anti-Reflection Device) objective lens insert for improved light transmission and reduced glint.

Can I attach a red dot or other accessory optic to this scope?

Yes. The eyepiece housing includes threaded bosses that allow you to mount complementary optics like the Trijicon RMR or other target designators for close-quarters situations.