6 Best Rifle Scopes For AR15

We have tested many scopes on different rifles to shoot targets up to 25 - 200+ yards.

In this guide, let's check out the 5 best scopes for AR15 based on reticle designs, eye relief, magnification, low light performance and price.

If you're looking for a fixed red dot sight, please click here.

Let's check them out.

Save Up To 35% on Trijicon Red Dot Sights

Best Scopes For AR15 [Up To 100 - 600 Yards]

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ar15 with primary arms slx 1-6x acss

Why Use This Scope? - As optics technology has significantly improved. While you can spend a money on a 1-4X in the past, you can get a very high quality Primary Arms 1-6X scope with more magnification and capability today.

Affordable 1-6X - Unlike other 1-6X on the market that cost over $1000, the Primary Arms is the best affordable 1-6X option for anyone starting new or experienced.

Crisp Image - Super clear image at 1X and the same at 6X even under dusk and dawn lighting condition.


ACSS Raptor Reticle - Calibrated 5.56 BDC reticle combined with vertical auto ranging scale to quickly estimate known target size distance & moving target holdover to hit targets accurately

Capped Tactical Turret - Once zeroed the elevation and windage turrets are protected from unexpected adjustments. To adjust - remove caps and dial turrets without any tool.

  • Magnification: 1-6X
  • Objective Lens: 24mm
  • Focal Plane: Second Focal Plane
  • Tube Size: 30mm
  • Reticle Type: ACSS
  • Turret : 0.5 / click
  • Length: 10.0 inches
  • Weight: 16.9 oz

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Primary Arms

Trijicon ACOG 3.5 X 35 - Best Durability

usmc hk416 with acog 3.5x

Why Use Trijicon ACOG - The Trijicon ACOG scope is the standard-issue fixed magnification optic for the US military. It's built like a tank to survive any damages that a new 18 yr old military recruit could possibly do, knowing that they don't usually take care of their issued gears. So it's bombproof.

Improved Eye Relief - Unlike the ACOG 4X where the shooter has to get very close to the ocular lens. The 3.5X model gives more eye relief distance for better cheek position.

Trijicon ACOG Reticle styles basics

Various Reticle Options - Tons of fast aiming reticles to pick from. We recommend the ACSS reticle for fast ranging and target acquisition.

Aim Even In Low Light - Fiber optics on top of the ACOG illuminates the reticle even in low light conditions as long as it's not completely dark.

Aim Both Eyes Open - Trijicon's Bindon Aiming Concept allows shooters to aim with both eyes open for improved situational awareness.

  • 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

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Vortex Gen 2 Spitfire 5X - Best Compact Size

Why Buy the New Spitfire Gen 2? - The Spitfire Gen 2 is a brand new 2021 model hybrid sight between a red dot and a magnified prism sight in a compact package. No magnifier needed.

Compact Size - Much lighter, compact, and snag-free than the original Spitfire 3X prism sight

Piggyback A 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.

Big Eye Box - Get behind the sight fast with a lot of room to shift the eye inside the eye box without seeing scope shadow

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

Uses Aimpoint Micro Mount - Uses any aftermarket Aimpoint Micro mounts you like with various height options


  • Magnification: 5X
  • Objective Lens: 25mm
  • Eye Relief: 2.7"
  • Reticle Type: AR BDC 4
  • Turret : 1 MOA / Click
  • Length: 3.6 inches
  • Weight: 10.3 oz

Why Use The Vortex Micro 3X? - Turn a 1X power red dot or holographic sight into a 3X mid-range optic without any mod.

Fast Sight Transition - Transition between 1X and 3X in no time! 

Better Target ID - Just flip the 3X magnifier right in front of the red dot for long-distance target ID and aim.

Better Zero - Zero 1 or 2 MOA size red dot reticle to a greater degree precision +/- 0.2 MOA on 3X than 1X.

Quick Detach - Remove the magnifier off the top receiver at any time without tool or affecting the red dot setup

Read Detailed Review Here

vortex razor 1-10x24 gen 3 lpvo

Why pick this low power variable optic - The RAZOR HD Gen 3 1-10X bridges the gap between CQB and long-range capability into one super versatile scope. While you consider a 1-8X scope, the 1-10X is a better LPVO option for all variants of AR15 rifles.

Long Range Capable - 10X power bridges the gap between a mid-range LPVO with a long-range precision FFP scope up to 1000 yard shot without compromising size, clarity or field of view.

Moving Target Hold - Get lead on moving target accurately with dotted moving target holds without any guess work 

Fast 1X Target Acquisition - 3 inward arrows quickly draws the eye quickly to the illuminated center reticle for CQB actions. 

vortex razor 1-10x lpvo at 1x engaging targets

Range Target Fast - Quickly estimate the target distance as well as holdover and windage corrections simply by superimpose the hashmarked ranging subtension lines on the target.

Warranty - You break it, Vortex will replace it at no cost with a lifetime, unconditional warranty. Even if it is not a original purchase.


  • Magnification: 1-10X
  • Objective Lens: 24mm
  • Focal Plane: First Focal
  • Tube Size: 34mm
  • Reticle Type: EBR 9
  • Turret : 0.25 / click
  • Length: 10.1 inches
  • Weight: 21.5 oz

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ELCAN SPECTDR 1-4X - Best Gucci Spec Ops Optic


Why ELCAN? The ELCAN Specter 1-4X is for AR15 owners who want what the special operation units use in the real world. It has unique dual role capability in a small package, and this is the sight often seen in actual combat track record unlike other scopes we have recommended above.

Fast Magnification Dial - Go from 1X to 4X immediately, and skip 2X and 3X that shooters never use anyway. Just flip the magnification lever like a switch.

Built Like A Tank - Raytheon Technology built the ELCAN for battle rifles as tough as their aerospace defense weapon systems to win conventional wars for the warfighters.

elcan specterdr on mk18 sbr

Clear Glass & Large FOV - No tube effect! The large FOV at 4X feels like looking at the target on a 50" TV through the scope right in front of the eye.

BDC Reticle - Calibrated for the NATO 5.56 up to effective 1000 yards (100 yd zero) with fast ranging scale to estimate target distance without getting off the scope.

Compact For Dual Role Missions - Go from CQB to Mid Range using only one compact size scope. Much more compact than using a long tube style low power variable optic


  • Magnification: 1-4X
  • Objective Lens: 32mm
  • Eye Relief: 2.75"
  • Reticle Type: 5.56 BDC
  • Turret : 0.5/ Click
  • Length: 6.02 inches
  • Weight: 23.2 oz

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