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

Manufactured by Primary Arms
MPN: 710001
Manufactured by Primary Arms
36 Reviews

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

This rifle scope is part of our SLx optics line. SLx optics built our 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 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 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”.
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Battery TypeCR2032 3V Lithium Coin
BrandPrimary Arms
Click Value1/2 MOA
Eye Relief3.70 in
Field View 10076.30 ft
Manufacturer.Primary Arms
Night Vision CompatibleNon-Compatible
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

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

36 reviews

  • 3 stars
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  • 1 star
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Worth the wait so far!

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Wow, long wait to be released but first impression is that this optic is awesome! Reticle is super crisp and sharp, even without my glasses... Will update review after I’ve had a chance to play with it more and some shooting on my AR and shotgun.

Worth the wait so far...

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Waited a long time for these to become available and so far, it looks like it's been worth the wait. Nice, sturdy optic... Very clear glass and super crisp, sharp reticle; love the ACSS... Will need to see how it holds up after a few hundred rounds on the AR and semi-auto shotgun and will update review accordingly.


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The optic itself is excellent and the reticle is clear as well as the glass. Not bad for only 9 0z. The optic comes with a riser that leads to an absolute co-witness so if you want a 1/3 to take advantage of the range estimator, I would get a different riser that PA sells. The only complaint that I have due to personal eye problems that the optic is not at fault for is that my dominant eye is -2.5 and I can't get a clear reticle even with the diopter adjustor. With glasses their are no issues. Great job PA

Love it!

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Awesome optic! Worth every penny! Another winner from Primary Arms

Great optic

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The Primary Arms 1X Compact Prism Scope with ACSS Cyclops reticle is a great optic for people like me with an astigmatism. At first, the center of the reticle was a little blurry in my dominant eye. I went to the eye doctor and found out that I have early stage cataracts in the near the center of both eyes. I can still get the optic to focus for use on my AR-47 that I built for deer hunting as a bush rifle. The only complaint I would have for the optic is the reticle. I wished it was similar to the Holosun HS503G Red Dot Sight with the ACSS CQB Reticle, which I like better for longer ranges. This is still a great ACSS optic for us shooters with an astigmatism. Get one and try it you will love it.

Great bang for the buck

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So glad to have an optic that is lightweight and works with my astigmatism. Like others have mentioned, the mount gives you an absolute cowitness but is lower than other regular cowitness mounts. If you prefer a lower 1/3 cowitness, buy an absolute cowitness mount from any who make them. This thing is good to go.

Great 1x Optic

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A great option for folks who prefer prism optics and don't want to spring for a TA-44 or want a 1x optic.
<br>Mounted on a RS-Regulate 302 rear bias mount, with an AKML it's a great optic for an AKSU and can be mounted so it does not interfere with the hinged top cover. You will NOT have a co-witness on an AK, the sight is taller than a micro-red dot.

First Impressions: Big Thumbs-Up!

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I love how this corrects for my vision defects. Both target & reticle are very sharp, glass is surprisingly clear.
<br>IMHO, this simplified ACSS reticle is far superior to those currently offered by other 1x prism optics.
<br>Sighting in was easy. However, the clicks are both fine & small but thankfully tactile.
<br>I'm glad I went with an appx 1/3 cowitness (used an ADM QD absolute cowitness mount), this height is both comfortable to shoot from and the ranging hashes clear my FSB, total weight is appx 10.5 oz.
<br>Eye relief and eyebox are both generous.
<br>My only minor complaint is the brightness control knob is very stiff (not that I expect to use it much, but still...). I find setting 3/11 adequate for lowlight/WML use which is the only time I expect to use the battery.
<br>I highly recommend checking out the Cyclops if you have vision problems that fall within its ability to correct.

Another 5 Star Review

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I have this mounted on a Sig 556R (7.62x39) using a low mount I had laying around. (Compatibility with T1 type mounts a BIG plus.) The glass is very clear and the reticle and target are both sharper than I get with my astigmatism and a red dot. Bullet drop is right on at 300. The illumination isn't quite "daylight bright" in the AZ sun but the black reticle works great for most targets. There is the possibility of a dark target where the reticle won't be as easy to see. In that case you can use the illumination. The 1X is close enough that shooting both eyes open is very natural. Some have complained that the turret cap tethers can bind so you have to hold the tether while you are screwing the caps off or on. Since you should only have to do this when you zero it seems like a trivial matter.

Great little RDS replacement w/adjustable diaopter

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Built like a brick. Fast to pick up daytime with no illum. Glass quality seems to be better than other PA scopes, and they’re fine. A blessing for people with astigmatism and need a adjustable diaopter. Uses t1 mounts. Bang for buck 9/10.

Wow. Love it.

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The ACSS is not small! I am quite impressed. The chevron and the range estimation hashes are clearly visible and sharp from CQB - 400+ yards target acquisition—and accurate. It’s an awesome reticle. Simple and highly effective. The adjustable diopeter focus ring really makes a difference and anyone can fine tune the focus to their eye(s).<br><br>Anyone who complains about “daylight reticle brightness” is seriously over exaggerating. The black reticle contrasts all dark and bright foliage from greens, browns, reds, yellows and in betweens. So far, there hasn’t been much of a scenario that needed illumination. Obvi perserving battery life exponentially. However I can see for dusk/dawn scenarios or building/room clearing the illumination being a huge plus. I’ve cleared my house numerous times to test this out. You’re welcome.

Good multi use scope.

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I wanted a multi use optic for my patol rifle. It has survived being bounced around in a vehicle rack and impacts with solid objects. It has held zero through qualifications, CQB training, and off duty weekend ranges.

AR47 - 5/5 solid replacement for iron sights.

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I bought an AR47 upper with front sight for a questionably cheap price from a different site. Turns out, the front sight was crooked. But the rest of the parts were good, so I knocked it off and replaced the gas block.
<br>Then after verifying functionality, I got this. What a treat. Even with my mediocre vision, the chevron is crisp. With glasses, even better.
<br>Sighting in at about 50 yards, only took a few clicks on each knob. The tip of the chevron hits like a tack.

A great alternative to a standard red dot!

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Great option for us with vision issues (or not;))! I have an astigmatism and the diopter ring allowed sharp focusing of the reticle that fit my vision requirements. Sighting in was easy and the glass is very clear. Note - the OEM mount does not line up with a lower 1/3 co-witness ADM swing away mount I had on my PA LER 3X magnifier. The magnifier ended up about 1/4" higher than the top of the optic's rear sight ring. I had to buy the ADM absolute co-witness mount for the Cyclops so the magnifier would line up. Seems kind of counterintuitive but it worked. Once that was taken care of, adjusting the diopter ring on the magnifier brought the reticle clearly into view and looks almost as good as looking through the optic itself. Overall very happy and would buy again.

Great but not Perfect

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This is honestly the best available solution for a compact light weight CQC optic for those of us that have an astigmatism. Perfect size and weight, glass is clear. I am rating it 5 stars because it is currently the best option I know of but I think it has a few cons, The Illumination could be a lot brighter, it simply is not daylight visible at all, But the main thing that bugs me is the Reticle is Too Small... Essentially the Chevron is so tiny its practically a little dot. IMO the size of the Reticle makes the ACSS Ranging functionality useless, the cheveron is supposed to allow you to adjust for bullet drop but if you cannot see where the various points are at on the chevron then you cannot use it how it was meant to be used... I am hoping for a Cyclops II to be released in the future that addresses those 2 small gripes... The Reticle needs to be double the size it is.

Defintely a Keeper!

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I mounted this optic on a PSA AR-15 10.5 Pistol and out of the box the optic was zeroed for a 50/200 yard zero. Never had to open the turret caps! The glass is crystal clear and the supplied mount is solid. Thanks PA for making affordable products!!

ACSS is a killer...

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Blah, blah, blah, it's the best etched reticle scope for the money. If it broke tomorrow, I'd buy another.

1x clarity

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As many have mentioned in previous reviews, the Cyclops is a well made and light weight optic with excellent glass. The reason I purchased the Cyclops is due to my difficulty in using a red dot sight. My eyes do not focus well on the projected red dot. The Cyclops solves that problem and more with the ACSS reticle. I will be buying more Cyclops in the future.

Great, but the reticle is a little small.


Great optic. The reticle is smaller than I expected. I was thinking it'd be closer to the ACSS Holosun red dot, but it's a good bit smaller. That being said, quality is fantastic. I'd love to see a model down the road that introduced a larger reticle, and that had green illumination.

Nice optic

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This optic is very nice for the price. I will warn you that the etching on the reticle is very small, so do not be surprised if you thought it was going to be bigger. If your eyes are extremely good you will not care. But my eyes are not bad, just a little less than great. Not what they used to be. I can still make out the etching and hit what I want, but it is a little more difficult than I thought it would be. Other than that I love it so far.

Great help for those with an astigmatism and the BDC works as advertised

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I have an astigmatism and though I'd give this 1X prism a try. It replaced an Aimpoint PRO on my 16" 5.56 rifle. I paired up the cyclops with a one of the new Holosun 3X magnifiers. Took it to the range and shot it out to 200 yds. The BDC works as advertised after a 50yd 0 with 64 grain .223 powerpoint ammo. Had a nice grouping of center mass hits out to the 8 ring on the target. The glass is very clear and the diopter lets you focus the reticle to your eye very easily. Definitely worth the money!

Great Product! Great Price!

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This optic is solidly built. I can’t see anyone describing it as “fragile”. It is robust without presenting with excess weight.
<br>The factory supplied base is wonderful. I wouldn’t bother upgrading it. The entire setup has flawless fit and finish. Adjustments are firm.
<br>My sole concern is that the reticle is so profoundly small. The horseshoe is perfectly observable and does make a nice aiming point However, the chevron is difficult to see. I would like to see PA lose the horseshoe, and double the chevron. JMHO.
<br>I would not even think of returning the optic to PA due to my few concerns. I am likely to purchase an additional one for my AR15 .22LR upper.

A 1X Mini ACOG at 1/4 The Price!

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After using one on three different rifles the past few months I just bought two more. These are like a 1X mini acog, only with better features - adjustable illumination and adjustable diopter focus - at 1/4 the price!

A+++. 👍👍👍

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Great little optic made better when paired with a 3x magnifier. The "3000 hour battery life on a medium setting" however is a little misleading. 3 different brands of batteries, left at setting 5, I averaged 92 days or just a little over 2,200 hours. But 3 months of "set it and forget it" isn't bad at all. My astigmatism has made me transition away from standard red dots to LPVO's or prismatic sights and this optic works great for me



Wow! I was so impressed with this optic. The glass is clearer than my EOtech’s, and the etched reticle is very fine. The BDC is very useful, especially with a magnifier. The donut of death on the ACSS reticle makes quick shots to a torso sized target very easy. This optic replaced my Eotech XPS2. Very pleased with it. My only gripe is that it is not as durable. From light training, a dent formed on the top of the scope, making the threads for a sunshade unusable. I was not planning on getting a sunshade, so it doesn’t bother me, but it concerns me about whether this optic would hold out through a combat scenario. As a civilian no longer overseas, I don’t need to worry about that, but I like knowing my equipment is bombproof. For $239, you’re getting the best you can get in this price range, no doubt about it. You won’t regret picking this versatile, clear, well thought out optic!