The Trijicon ACOG 3.5x35mm Red Donut .223/5.56 BDC (model 100136, UPC 719307300064) is a combat-proven optic built for shooters who demand rugged reliability, fast target acquisition, and true “always on” illumination. With a fixed 3.5x magnification, 35mm objective lens, and dual-illuminated red donut .223/5.56 BDC reticle, this ACOG is purpose-built for AR-15 / M16 platforms in 5.56 NATO, delivering precise holds from CQB distances out to 800 meters. trijicon.com+2OpticsPlanet+2
Forged from aircraft-grade aluminum and finished in black hardcoat anodizing, this 3.5x35 ACOG is built to survive battlefield abuse while offering crystal-clear glass and a bright, intuitive reticle for both daylight and low-light shooting. Night Vision Guys+1
Always-On Illumination – No Batteries Required
One of the defining features of the Trijicon ACOG 3.5x35 is its dual-illumination system. A combination of fiber optics and tritium keeps your red donut reticle visible in nearly any lighting condition without ever relying on batteries. trijicon.com+1
Fiber optics automatically adjust reticle brightness based on available ambient light, so your aiming point is always easy to pick up in full sun or shade.
Tritium phosphor lamps take over in low-light and no-light situations, glowing without switches, buttons, or external power sources.
No batteries to change, no electronics to fail—just a true “always on, always ready” optic trusted by military, law enforcement, and serious civilian shooters worldwide. trijicon.com+1
3.5x Magnification with BAC – Fast & Precise Shooting
The 3.5x fixed magnification hits a sweet spot: enough zoom for confident hits at distance, yet still fast up close when used with Trijicon’s Bindon Aiming Concept (BAC). trijicon.com+1
BAC “both-eyes-open” shooting lets you use the ACOG almost like a red dot at close range, overlaying the illuminated donut over your target while maintaining full peripheral vision.
At mid-range and long distances, the crisp 3.5x image and clearly defined BDC holdovers help you make precise shots with 5.56 NATO/.223 Rem.
If you need an optic that’s fast from 0–50 yards but still accurate out to hundreds of meters, this TA11-pattern ACOG configuration is built for that role. Range USA+1
Red Donut .223/5.56 BDC Reticle – Calibrated Out to 800 Meters
The heart of this model is the illuminated red donut .223/5.56 BDC reticle. Designed specifically around 5.56 NATO ballistics, the reticle features a bold donut center that’s quick to acquire, with bullet drop compensation marks that allow you to range and hold out to 800 meters with appropriate ammunition. OpticsPlanet+2Buds Gun Shop+2
Reticle advantages:
Red donut aiming point that doesn’t obscure the target, even at smaller silhouettes. Range USA
Calibrated BDC stadia for .223/5.56, giving you known holds at extended ranges—ideal for duty rifles, competition rigs, or serious defensive setups.
Works seamlessly with BAC for close quarters, while offering precision aiming when you settle in behind the optic.
This makes the 100136 ACOG an excellent choice for AR-15 shooters who want a true fighting optic that seamlessly transitions from CQB to long-range engagements.
Rugged Forged Housing – Built for Real-World Abuse
Like other Trijicon ACOG models, the 3.5x35 100136 is built around a forged aluminum housing designed to survive combat conditions and heavy recoil. images.coreware.com+2Night Vision Guys+2
Key durability features:
Forged aluminum body (7075-T6 class) with black hardcoat anodized finish for maximum strength and corrosion resistance. Night Vision Guys+1
Waterproof, fogproof, and shockproof design, dry nitrogen–filled to prevent internal fogging and proven to withstand extreme recoil and harsh drops. shadowtactical.com+1
Built to easily pass US military durability tests and used extensively on AR-platform rifles in demanding environments.
Whether you’re harshly running drills, competing, or deploying in the field, this ACOG is engineered to keep working when cheaper optics fail.
Bright, Clear Glass & Generous Field of View
The Trijicon ACOG 3.5x35mm is known for its outstanding glass clarity and optical performance:
The combination of a large objective lens and Trijicon’s coatings gives you a bright, sharp image that maintains detail from dawn through dusk.
Compact, Lightweight, and Ready to Mount
Despite its rugged construction, this ACOG remains compact and relatively lightweight:
It’s designed primarily for AR-15 / M16 platforms, and many configurations include an M16/AR-15 carry handle base mount, depending on the vendor. Palmetto State Armory+2FAFO Industries+2
The low weight and small footprint allow the ACOG to balance well on carbines, mid-length rifles, and full-size AR platforms without making the rifle feel front-heavy.
Ideal Use Cases – From Duty Rifle to Defensive Carbine
The Trijicon ACOG 3.5x35 Red Donut .223/5.56 BDC (100136) is particularly well suited for:
Duty and patrol rifles where ruggedness, battery-free operation, and instant readiness are non-negotiable.
Defensive AR-15 carbines for home or ranch defense, offering fast CQB performance with enough magnification for longer shots on property.
Competition and training where the combination of BAC speed and BDC precision allows you to dominate multi-distance stages.
Preparedness and SHTF builds that must remain functional even if batteries and electronics become unreliable.
If your priority is a combat-tested optic with minimal failure points and true all-light performance, this ACOG configuration delivers. images.coreware.com+2Classic Firearms+2
Key Specifications – Trijicon ACOG 3.5x35mm Red Donut 100136
Brand / Model: Trijicon ACOG
SKU / Part Number: 100136 (TA11 family) shadowtactical.com+1
UPC: 719307300064 tomlinsonshootingsupply.com+1
Magnification: 3.5x
Objective Lens Diameter: 35mm
Reticle: Dual-illuminated Red Donut .223/5.56 BDC (BAC enabled) trijicon.com+2Night Vision Guys+2
BDC Range: Holds calibrated for 5.56/.223 out to approx. 800 meters (with appropriate ammo) OpticsPlanet+1
Illumination: Tritium / fiber optic, battery-free
Eye Relief: 2.40"
Field of View: 28.90 ft @ 100 yds
Exit Pupil: ~9.9mm
Length: 8"
Weight: ~14 oz
Housing Material: Forged aluminum, black hardcoat anodized
Optic Coating: Multi-coated lenses
Weatherproofing: Waterproof, fogproof, and shockproof Night Vision Guys+2shadowtactical.com+2
Platform: Ideal for AR-15 / M16 rifles in .223/5.56
Mounting: Commonly supplied with M16/AR-15 carry handle base mount (verify package contents with your retailer) Palmetto State Armory+1
Why Choose the Trijicon ACOG 3.5x35 Red Donut 100136?
If you want a battle-proven 3.5x optic that combines battery-free illumination, a fast and intuitive red donut .223/5.56 BDC reticle, and legendary Trijicon durability, the ACOG 3.5x35mm 100136 is a top-tier choice. It offers:
True “set it and forget it” dependability
Lightning-fast target acquisition with BAC
Calibrated BDC for serious 5.56 performance at distance
A rugged, waterproof, fogproof housing built for hard use
From patrol cars and defensive carbines to competition rigs and prepared citizen rifles, this optic has earned its place as a gold-standard solution for shooters who simply can’t afford equipment failure. trijicon.com+2Night Vision Guys+2
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