Trijicon ACOG is the top brand field grade magnified prism sight. Here are the 4 best ACOG scope options for AR15.

They have great glass clarity and reticle options for aiming with both eyes open, astigmatism, and enable fast mid range target acquisition and range estimation.

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Trijicon ACOG TA31 - USMC Certified Combat Optic

Trijicon ACOG TA01 4x32mm Rifle Scope, Color: Flat Dark Earth, Sniper Gray, OD Green, Tube Diameter: 32 mm, Up to 32% Off w/ Free S&H — 4 models

The Trijicon ACOG TA31RCO-M855 is US Marine Corp's first Rifle Combat Optic (RCO) on M16A4 20" or 14.5". The scope enables the user to aim with Bindon Aiming Concept (aiming with both eyes open + maximum situational awareness). 

It provides ground troopers with the most durable optic on the battlefield, and crystal clear image to ID targets and to shoot accurate. These ACOG models are now available for civilian purchase.

Built Like A Tank - Withstand battlefield abuse and it has a long proven track record

Glass Etched Reticle Clarity - Calibrated for 5.56mm to shoot up to 600 meters. Reticle options also include 6.8 SPC and 300 BLK + bullet drop compensator

No Battery Required - Reticle stays on without battery

Back Up Iron or RMR - Secondary aiming solution is optional (Mount required), adding an Trijicon RMR is great for CQB red dot aiming

Short Eye Relief - Most people don't like short eye relief, but it provides the shooter the biggest target field of view while behind the scope

Versatile Mounting - Use any aftermarket ACOG mount including Quick Detach, or mount on old school M16 carry handle

  • Magnification: 4X
  • Objective Lens: 32mm
  • Reticle Type: Chevron, Horseshoe, Triangle, Donut, Crosshair
  • Eye Relief: 1.5"
  • Turret : 0.25 / click
  • Weight: 17.6 oz

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Palmetto State Armory

Trijicon ACOG 5.5X50 TA55 - Best For Long Range

Trijicon TA55 ACOG 5.5x50 Rifle Scopes Advanced Combat Optical Gunsight, Color: Black — Free 2 Day Shipping w/ code 2DAYAIR — 2 models

The Trijicon ACOG 5.5X50 is basically a 6X prism optic that extends the capability of a standard 4X ACOG scope to shoot up to 800 meters. If you want a durable fixed 6X magnification prism sight, this is the best option on the market.

800 Yards Enabled - Shoot up to 650 yards with holdover points at 5X magnification using illuminated AR-BDC4 reticle with 5.56 calibrated wind dot.

Much Finer Turret Adjustment - 0.2 MOA / click provides much finer reticle adjustments to get more accurate shot. About 0.05 MOA finer than most precision rifle scopes

Bigger Eye Box - This scope offers the largest objective lens and exit pupil specs among ACOG family scopes.

Piggyback Red Dot - Add a 1X red dot on top of the scope to transition from magnified view to 1X. Only available for the 5X model.

308 and 5.56 Calibrated - Get TA55A for 308 applications


  • Magnification: 5.5X
  • Objective Lens: 50mm
  • Eye Relief: 2.2"
  • Reticle Type: Chervon
  • Turret : 0.2 MOA / Click
  • Length: 12 inches
  • Weight: 25.6 oz

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Palmetto State Armory

Trijicon ACOG 3.5X TA11 - Best Durability

Trijicon ACOG 3.5x35 Scope, Dual Illuminated Crosshair .223 Ballistic Reticle w/ TA51 Mount, Red TA11J, Amber TA11J-A, Green TA11J-G, Color: Black, Up to 32% Off — Free 2 Day Shipping w/ code 2DAYAIR — 3 models

This shock resistant Trijicon ACOG 3.5X model features a much better eye relief performance than the original 4X model for helmet wearing users without the optic bumping into things.

Improved Eye Relief - The 3.5X model gives more eye relief distance for better cheek position.

Tighter Shot Groups - Same reticle options and aiming performance as the 4X ACOG

Various Reticle Options - We recommend the ACSS reticle for fast ranging and target acquisition.

Piggyback Offset Red Dot - Use an optional piggyback RMR mount to install a 1X red dot. Works with Holosun 507C as well

Daylight Reticle Illumination - Fiber optics illuminates the reticle even in low light conditions as long as it's not completely dark.

  • Magnification: 3.5X
  • Objective Lens: 35mm
  • Eye Relief: 2.39"
  • Reticle Type: TA11 BDC
  • Turret : 0.33 MOA / Click
  • Length: 8 inches
  • Weight: 14 oz

Trijicon ACOG 4X32 LED TA02 - Adjustable Reticle Brightness

Trijicon ACOG TA02 4x32mm Rifle Scope, 32mm Tube, Color: Black, Tube Diameter: 32 mm, Up to 32% Off w/ Free S&H — 8 models
Most ACOG scopes that feature fiber optic can be annoyingly bright under sunlight, or not bright enough in low light conditions. The Trijicon ACOG 4X32 LED model enables the user to set reticle brightness. This scope is great for a wide range of outdoor and indoor light conditions.

Built Like A Tank - This is built to the same specs as the TA10 model

6 Adjustable Brightness- Dial it on the go in any light conditions 

Better PID Under Sunlight - Crank down the reticle brightness to aim better without a distracting glowing reticle covering the target

BDC Reticle - Calibrated for the NATO 5.56 up to effective 600 yards 


  • Magnification: 1-4X
  • Objective Lens: 32mm
  • Eye Relief: 1.5"
  • Reticle Type: 5.56 BDC or 300BLK (Horseshe, Donut, Crosshair)
  • Turret : 0.5/ Click
  • Length: 6.02 inches
  • Weight: 18.1 oz

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