Primary Arms SLx Compact 1x20mm Prism Scope - ACSS Cyclops Reticle

Manufactured by Primary Arms
MPN: 710001
Manufactured by Primary Arms
56 Reviews
$139.99 $239.99

In Stock

Orders of non-FFL items will ship same-day if placed before 3:30pm CST. FFL orders will ship within 8 business days if transfer details are provided.

Receive FREE shipping on your entire order when you purchase this item.
For individual Officer, First Responder, and Military pricing please make sure you are logged in. for details



After rigorous field testing, this optic has been given a Silver-tier rating by the National Tactical Officers Association.

This Primary Arms rifle scope is part of the SLx optics line. SLx optics built their reputation for innovation, reliability, and value. All SLx optics undergo rigorous field-testing during development to best serve you in any environment.

The Primary Arms 1X Compact Prism Scope with ACSS Cyclops reticle combines the durability and flexibility of an etched reticle with the speed and ease of use of a red dot. Unlike most prism optics, the 1X Compact Prism Scope has a generous 3.7 inches of eye relief combined with a massive 13mm exit pupil to provide an exceptionally forgiving eye box. This allows for a high degree of efficiency in red dot-style shooting, keeping both eyes open for fast target acquisition in a variety of positions and circumstances that no other prism scope can touch. The 1X Compact Prism Scope’s included 1913 MIL STD Picatinny rail mount is removable, and the scope body is compatible with industry standard microdot mounts.

  • Silver-rated by the NTOA!
  • Glass etched reticle that works with illumination on or off
  • Partial reticle illumination with 11 brightness
  • CR2032 battery provides up to 13,000 hours of reticle illumination at medium settings
  • Forgiving eye box with nearly 4” of eye relief, and a bright 13mm exit pupil
  • Patented ACSS Cyclops reticle provides fast target acquisition, range estimation, and moving target leads out to 400 yards.
  • Quick adjust diopter ring for shooter-optimized reticle focus
  • ½ MOA click adjustments with capped turrets
  • Compact design at just 4” long and 9.7 ounces
  • Uses industry standard microdot mounts
  • Wide 76.3-yard field of view at 100 yards
  • Durable design for fog resistant, waterproof, and shock proof operation
  • Black hardcoat anodized finish
  • Protected by a lifetime warranty

At the heart of the 1X Compact Prism Scope is the new etched-glass ACSS Cyclops reticle. A heavy horseshoe makes rapid acquisition and reflex sight style snap shooting a breeze, especially when used in conjunction with the red reticle illumination. When speed is less important, the center chevron tip offers an infinitely precise point of aim that won’t cover the target, allowing for remarkable accuracy at long distances. Snap shots and precise hits aren’t the only tricks up this reticle’s sleeve, either! The edges of the horseshoe double as moving target leads, allowing for improved first shot hit probability on mobile targets. To account for the worst-case scenario, the etched reticle remains visible in black even when the scope loses power. Batteries are only needed for the full reticle illumination, giving you the flexibility of a high-contrast sight picture in the brightest of conditions.

The etched ACSS reticle combined with the fast focus eyepiece make this optic an excellent option for shooters with astigmatism. Red dots simply project an LED beam that reflects off glass back towards the shooter’s eye. The smaller the dot size, the more difficult it can be for the brain to resolve the shape, especially when combined with eye issues. This can lead to shooters perceiving the red dot as starbursts, comet tails, and a host of other distracting or obtrusive shapes depending on the shooter’s eye. Etched reticles and prism scopes don’t have this problem, and by adjusting the fast focus ocular ring, a perfectly crisp view of the reticle can be achieved for anyone. A clear sight picture will lead to more confident hits and better accuracy at further distances than ever before.

The 1X Prism Scope body is just as tough as the rest of the proven line of prism rifle scopes. During durability testing, the 1X Prism Scope outlived not one, but TWO piston-driven .308 Winchester rifles, selected specifically for their reputation for driving optics to failure. Combine that toughness with waterproof construction and nitrogen purging for fog resistance, and the 1X Prism Scope is an optic you can trust whether you’re a weekend plinker, a competitive ace, or a hunter in the field. Each optic is finished with a tough Type III hardcoat anodized black finish to keep your scope looking great for years.

The Primary Arms 1X Prism Scope is shipped with a riser mount that results in a centerline height of 1.41”, the standard height of an AR-15 platform front sight. A low base (1.05” to centerline) is also available as an accessory, which is useful for mounting to an AK-47 or other rifle with a stock located lower than the optics rail. In addition to these two mounts, two spacers are available for purchase to accommodate different applications and shooter preferences. When used with the riser mount they will result in a height to center line of 1.535”and 1.64”.

The 1X Prism Scope is compatible with all industry standard microdot style mounts, including QD options such as the popular American Defense AD-T1 series. When choosing a mount, note that the height from centerline of the scope to the surface where the mount attaches is .25” taller than a typical 20mm microdot. Therefore, if a mount normally results in a 20mm microdot sight height of 1.41”, installing it on the Primary Arms 1X prism scope will result in a taller height of 1.66”.
See More


Battery TypeCR2032 3V Lithium Coin
BrandPrimary Arms
Click Value1/2 MOA
Eye Relief3.70 in
Field View 10076.30 ft
Focal PlanePrism Scope
ManufacturerPrimary Arms
Mount CompatibilityAimpoint Micro
Night Vision CompatibleNon-Compatible
Optic SeriesSLx
Reticle ColorRed
Total Elevation Adjustment50 MOA
Total Windage Adjustment50 MOA
Turret FeaturesCapped Turrets, Tool Adjustable
TypeFixed Magnification
Weight9.7 Oz
  • Twang n Bang reaches out to 400 yards with 1x Cyclops
  • Sootch00 Full Review 1x Prism Cyclops
  • TiborasaurusRex reviews the 1x Cyclops
  • AKOU Demonstrates 1x Cyclops AK74 Advantages
  • MrGunsNGear Reviews the 1x Cyclops
  • Craziest Torture Test Ever by Armslist Media
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

56 reviews



by -

I had read a lot of reviews for this Cyclops and ordered one. When I first looked through it I was really wondering how it would be useful with such a small recticle. I was thinking that I made a mistake. I put it on a AR15 carbine that had hosted a Sig red dot. When I adjusted the diopter and began using it I was really impressed. I did not even bother with the illumination. In practicle use this optic is really great. I am very happy I bought it now. Don't be fooled like I was at the size of the recticle. In performance this unit is amazing.

Excellent sight

by -

This sight was amazing for my aging eyes. You can adjust the clarity of the reticle. Which for me was a game changer over red dot sights. Build quality is excellent and the mount is rock solid. I zeroed it on my Springfield Saint. The ACSS reticle is great! At 50 yards the reticle was dead on and kept zero after 100 rounds so far. Clicks were audible and tactile. The illumination was great in daylight. I bought another one for my 20” rifle!

My eyes love this optic.

by -

This is a great optic, great glass, available killflash, etched reticle and Adjustable Diopter. This means you can use it without a battery and you can hand it to your family members and be assured they can use it no matter how bad their eyes are. I am much faster with this out to 400 with both eyes open than my LPVO.

Cyclops Scope

by -

I experienced the best service from Primary Arms of any purchases I made in many years. I liked the scope so much I ordered a second one. Customer service is outstanding.


by -

Really nice and great service from Primary Arms.


by -

Solid. Never loses zero. Fits Scalarworks Leap perfectly. If you have astigmatism, this is the way to go.

Quality as expected from Primary Arms!

by -

After pouring over every review I could find on this, I pulled the trigger and ordered one as soon as it came in stock (would have preferred FDE, but still works with my "black and tan" theme going on with my current build). The optic is sturdy, easy to sight in, and I love the ACSS reticle. I was expecting a little bit larger reticle to actually see the V but that's me used to a 2MOA red dot. The illumination is kind of faint until you get about 5 or 6 when it's usable, but the etched black is great on its own. Definitely worth buying if you have any astigmatism and want to step up from red dot like a Romeo5, Holosun, etc.

Awesome little scope


I bought this scope about a month ago, and I love it. The glass is clear, zero distortions, reticle is far better than any 1 x scope I have used before. The illumination is crisp, no washout, and under NVG's it is clear as can be, even when illuminated. Glad I got it. Adjustments are repeatable, crisp, and allow for a wide range of caliber holds with the adjustment range. Extremely happy with my purchase

Awesome buy


I have a rather bad astigmatism. This sight has given me a new tool i can use to ger back to shooting like i want. It iscwell made and worked great on my AR pistol!! You cant go wrong here. Grear sight!!!

Way better than a red dot

by -

I am very glad I switched