Primary Arms SLx Compact 1x20 Prism Scope - ACSS-Cyclops - FDE

Manufactured by Primary Arms
MPN: 710002
Manufactured by Primary Arms
11 Reviews

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The SLx optics are the heart of our lineup. The trusted optics that have built our reputation through the years. Although many SLx optics will be familiar to Primary Arms fans, we are always pushing forward with new generations and adding even more options in response to the demands of our loyal customers.

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.

  • Glass etched reticle that works with illumination on or off
  • Partial reticle illumination with 11 brightness settings
  • CR2032 battery provides up to 3,000 hours 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 micro red dot mounts
  • Wide 76.3-yard field of view at 100 yards
  • Durable design for fog resistant, waterproof, and shock proof operation
  • Hardcoat anodized with tough FDE ceramic top coat
  • 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 our 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, under an equally tough FDE Ceramic finish to keep your scope looking great for years.

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”.

The PA1X prism scope is not a red dot sight. It is a prism scope, meaning that the reticle is visible regardless of battery power. The etched ACSS Cyclops reticle works more like a typical rifle scope than a red dot. Magnifiers will work with PA1X when placed in the standard configuration behind the PA1X. Special attention will need to be paid to focusing the magnifier on the reticle ensuring it is crisp and clear. This configuration can be used without introducing parallax or point of aim shift. In addition to the configuration described above a typical magnifier can be placed in front of the PA1X prism scope, however it will introduce a large amount of point of aim shift, parallax and overall unreliability of the optical system. It is not recommended to be used in this configuration.

Due to the fundamental nature of the PA1X prism scope’s optical system, it operates differently than a typical red dot. It can be used in line (co-witness) with iron sights like a typical red dot. When placed in line with iron sights the front sight can be visible through the scope. However, the iron sights should be zeroed while in line with the PA1X to account for any point of aim shift introduced by having the PA1X in line with the iron sights. It should also be noted that co-witnessing of iron sights is not necessary with the PA1X like it is with a red dot sight, because the ACSS Cyclops reticle is always visible regardless of battery voltage or even having a battery installed.

The Primary Arms 1X Compact Prism Scope with ACSS Cyclops reticle is the smart alternative to red dots for shooters with astigmatism or other eye issues, or shooters who want advanced ACSS reticle features in a true 1x optic. This product is covered by the Primary Arms Lifetime Warranty.
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Battery TypeCR2032 3V Lithium Coin
BrandPrimary Arms
Capped TurretsCapped Turrets
Click Value1/2 MOA
Eye Relief3.70 in
Field View 10076.30 ft
Finger Adjustable TurretsTool Adjustable
Manufacturer.Primary Arms
Night Vision CompatibleNon-Compatible
ReticleACSS Cyclops
Turret FeaturesCapped Turrets, Tool Adjustable
TypeFixed Magnification
Weight9.7 Oz
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  • Craziest Torture Test Ever by Armslist Media

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

11 reviews



by -

Awesome optic in an awesome color. Proud to be the first reviewer giving 5 stars.

Primary arms you did it again !

by -

Best optic , crystal clear glass and the reticle is awesome. My groupings have been sub MOA at the range. The main star is the costumer service top of the line as alway . I wish I had four hand so I can give this four thumbs way up !



I purchased the Primary Arms 1X compact prism scope with the illuminated ACSS Cyclops reticle from a different vendor. My first impression is not a very good one. The ACSS reticle is so small that I can barely make out the chevron. BDC and ranging with this reticle is almost impossible. I think a separate magnifier is necessary for the reticle to be useful. Also, the illumination function is very poor in bright daylight. Even on the maximum setting, the reticle is barely illuminated. I think the manufacturer should at least etch these reticles with a larger “horseshoe “ .
<br>From PA: Take extra time is setting the diopter and you will get a clear crisp reticle. Yes it is small. No way around that because of no magnification but if you properly set the diopter to account for less than perfect vision it will be visible. On the illumination remember that this is not a red dot. If the ambient light is very bright you might be better off using the black etched reticle. It will give better contrast on light backgrounds and very bright settings.

Great optic

by -

Solid scope, clear glass, and accurate. FDE looks great. Like it better than I expected.

Another excellent PA product !

by -

This is my 2nd ACSS scope purchase, I have the 3X in 7.62/.300BO and just today I received my cyclops in the mail. Both scopes have excellent glass for price point. Take the time to learn the capabilities of the scope/reticle it'll be impossible to not love it! I do wish the reticle would be a tab bit bigger in the cyclops, but defiantly nothing to complain about. I have older eyes that don't work as good as they use to and it is not hard to see/use at all. Keep up the good work & lower prices PA!



I ordered this optic because I have some astigmatism and red dots tend to bloom on me. To be honest it sat in the box in my office for a couple of months before I finally mounted in on a M4 clone carbine. This little scope is amazing outside! The glass in surprisingly clear for this price point. As time and money allow, I will be replacing most of my red dots with these little jewels.

Very nice but lame labeling

by -

This thing is amazing, I love it, so nice to have an etched reticle. I just got it so we'll see how it holds up, but it looks fantastic. It will be replacing my Eotechs on some of my blasting guns.
<br>Only gave it 4 stars because MY GOD WHY DOES EVERY COMPANY HAVE TO MAKE THEIR PRODUCTS A BILLBOARD. I HATE the giant white letters saying primary arms on the side. Come on, way to ruin the nice tan color of this nice looking optic. The labeling ruins it.

Damn You PA !!!

by -

I will have to replace all my red dots...The field of view is amazing. Glass super clear and set a new standard for me. Price point is great. I was going to buy a Eotech but I can buy 2 of these for the same price!!

Great optic!!!

by -

Great optic, I think this is close to the ultimate no magnification sight. Can be illuminated, however there is really no need, unless it’s lower light, or going from light to darker background, such as the outside of a building looking inside an entry. Now a gripe... the people giving this optic a 3 or 4 stars.. for ignorant reasons, such as labeling or reticle size!!! Give me a break...

Great optic.


Great optic. Easy to mount and zero. Illumination is sufficient for what it is. Nice low profile. Good weight for a prism scope. Only gripe is the reticle. With no magnification most of us cannot see far enough to make accurate hits out to distance and use the reticle to it's full advantage. I would LOVE for this optic to have the K.I.S.S. reticle!

BUY IT if red dots are blurry for you! Clear Glass!


My main reason for buying this is because red dots can really blur or star out for me, making it difficult to get a consistent aiming point. I love my acog so I knew i would like a prism optic. Sure enough primary arms delivered. The glass is super clear and the reticle is very sharp. You should know however, the reticle is small, some may not be able to distinguish the chevron. Also, the Illumination is not what i would call daylight bright. You can see some red that gives it contrast, but nothing like my acog. At dusk/night though, it's nice to have the illumination. All that said, I would buy the optic again, and will probably get more.