Primary Arms SLx 2.5 Compact 2.5x32 Prism Scope - ACSS CQB-M1 Reticle

Manufactured by Primary Arms
MPN: 710003
Manufactured by Primary Arms
137 Reviews

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This Primary Arms prism 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 2.5X Compact Prism Scope with ACSS CQB-M1 reticle is the lightweight, do-everything scope you've been looking for. The low 2.5X magnification and bright illuminated reticle allow for fast, both-eyes-open shooting at close range, while the ACSS CQB-M1 reticle allows for easy hits on targets out to an impressive 600 yards. Whether you're looking for a new scope for competition, hunting, or plinking, why look any further?

  • ACSS 5.56 CQB-M1 reticle has BDC and ranging out to 600 yards with 5.56 NATO, .223 Remington, 5.45x39mm, and .308 Winchester
  • Fully illuminated reticle is visible even in bright daylight
  • Optional M1913 Picatinny top rail for piggy-backed red dot sights
  • Generous 10.16mm exit pupil allows for a bright sight picture and forgiving eye box
  • 37.5ft field of view at 100 yards provides easier tracking of mobile targets
  • 2.7" of eye relief
  • 1/2 MOA turret clicks are tactile and audible for easy zeroing
  • Tough prism scope is waterproof, fog resistant, and shockproof
  • Durable Type II hardcoat anodized black finish
  • Compatible with standard AR15 carry handle mounts
  • Protected by a lifetime warranty

The heart of the tough 2.5X Prism Scope is the ACSS 5.56 CQB-M1 reticle that combines ranging, wind leads, moving target leads, and ballistic drop compensation out to 600 yards. The outer horseshoe of the glass etched reticle is used for close quarters engagement, simply place the generous semi-circle on the target and run with it! Each side of the horseshoe also has the integrated ranging system. Place the bottom of the target on the bottom rung and range up. If you know your targets are roughly 18 inches wide, they can be ranged on the side Auto Range system, or directly on the BDC hold overs! Two dots on either side of the inner horseshoe offer a moving target lead moving with an average speed of 8.6 MPH. As an added bonus, the glass etched reticle does not require batteries or illumination, but 11 brightness settings (including daylight bright) allow for fast acquisition in close quarters, or enhanced visibility in fading light, powered by a common CR2032 battery!

The PAC2.5X offers mounting flexibility to suit your needs. The included 1913 MIL-STD Picatinny thumbscrew mount can be removed and replaced with any mount that accepts AR-15 carry handle-type optics, or simply so you can mount the 2.5x Prism Scope directly to an AR-15 style carry handle. Optionally, shooters can add an M1913 picatinny rail to the top of the optic to piggyback a red dot back up sight. The PAC2.5X offers the perfect amount of magnification to balance close quarters speed with hits at medium range, in a flexible and durable package.
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Battery TypeCR2032 3V Lithium Coin
BrandPrimary Arms
Click Value1/2 MOA
Eye Relief2.70 in
Field View 10037.50 ft
Focal PlanePrism Scope
Manufacturer.Primary Arms
Mount CompatibilityTrijicon ACOG
Optic SeriesSLx
ReticleACSS CQB M1
Reticle ColorRed
Turret FeaturesCapped Turrets, Tool Adjustable
Weight14.9 Oz
  • Primary Arms 2.5x and 4x ACSS Review by MrGunsNGear
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

137 reviews


Exceptional Optic at a phenomenal price!

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Words won’t do this little optic justice.
If you are looking for a solid optic for CQB out to 300yards and beyond, look no further!
The only other optic I would consider is the ACOG at $1,200.00.

Just buy it


Bought this last year for my ar9 and this thing is awesome. I could demolish a 3" bullseye Target at the range all the way back (75 ft). It's small, light and accurate for such a inexpensive scope. Great job Primary Arms.

Great Optic, Great price

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Red dot didn’t work for me, along with having an astigmatism, I found that my target was not as sharps as it could be even 20-25 yards indoors. I hoped that this 2.5X prism would be the solution to both my problems and I am completely satisfied. Reticle is sharp and the small amount of magnification is perfect. Worked fine indoors with illumination off (black) and on (red). Eye relief is decent, a bit of an adjustment coming from an unlimited eye relief open emitter dot, but perfectly acceptable. The offset mounting allows you to bring it farther back if needed and you still have room to grab the charging handle without issues. Listening to other reviews I degreased the screws and used blue Loctite (as the manual suggests). A quick note to the reviews mentioning the reticle is off-center or crooked. I believe this is an optical illusion as mine appeared tilted slightly counter clockwise while shooting right-handed, switching to left it looked tilted slightly clockwise.

Clear Glass, Great Reticle

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The glass is plenty clear and the reticle is by far the best available. The mount is good quality but I will likely swap out for a slightly taller one as I can see my thumb in the bottom of the lens whenever I grip the handguard. I can actually see my collapsed MBUS Pro front sight as well. Not deal breakers at all, especially since these take the super abundant ACOG mount. Only complaint is eye relief. Eye relief is naturally not as good when compared to red dots but I was hoping for a little more. I have a short length of pull naturally (2nd position) but still had to mount all the way back on the receiver to get a full picture. No big deal as you can easily just mount front BUIS in front of this optic.

love it

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on a 9mm ar pistol....great 2 eye visibility, love the reticle...magnification is perfect. Would buy again....

Primary Arms SLX 2.5 Compact Prism scope

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Got this a few days ago and am amazed by this scope. Very good glass, magnification is good. I like it. Will order another one for another AR

Unbeatable Sweet Spot


Cantilever mount, stupid simple lockup, crisp AND bright (no bloom or blur on the reticle). Tried this against a Vortex 3x Spitfire Gen2. Note to self, never get a rifle optic of any kind with an objective less than 25mm. 32mm like the SLX is the sweetspot for magnification under 5x. The Spitfire costs $100 MORE if you find it on sale but its like looking through a straw where this one is like looking through a TP tube, much better eye box and relief.



Crystal clear and holds zero.

Great optic


For the money you would be hard pressed to find better. Flawless on many different platforms and holds zero when swapped very well

solid choice

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This 2.5 prism is a solid optic. Acss work great and have taken the ar out to 500 yards with just a little effort. I own 3 of this model and 7 PA scopes overall. They are perform very well.