Recently Primary Arms updated the SLx 4-16x44. This update gave the feature rich, SLx 4-16 some new reticles. One of those is the ARC-2 MOA, a simple, yet effective, illuminated reticle. I was excited to put this optic through its paces and it did not disappoint. Primary Arms’ SLx line is what I like to call performance packed optics at a price everyone can afford.
To put it simply, the SLx 4-16x44 FFP has magnification of 4x to 16x. It has a 44mm objective lens and a 30mm tube to help gather as much light as possible. Magnification is adjusted with a ring back by the eyepiece. The ring has a raised “fin” that can be removed if you don’t like it. It has a side parallax adjustment that goes from 20 yds to infinity. On the end, of said parallax adjustment, is the illumination ring. It has 11 values to illuminate the ARC-2 reticle. The lowest 2 settings are night vision compatible. The highest setting is “daylight” bright. I can actually see a little bit of red illumination in bright sunlight, something I can’t always say when things are “daylight bright”. The adjustment turrets on the SLx are of the tactical style. They are not capped, nor can they be. They have a pretty good tactile feel for the 1/4 MOA clicks, but are not very audible, if at all. These turrets are resettable to zero with the supplied allen wrench. No zero stop, but I can’t knock a $300 scope for that.
Now that you have a general rundown of the optic, it’s time for more. I’ll start with the glass. For this being in the SLx line, the glass clarity is great, even at full 16x magnification. I could make out a wire fence at around 500 yds, see picture. The fast focus eyepiece gets the reticle super clear and the parallax adjustment gets the image spot on at all different ranges. I really am amazed at how clear the glass is for a $300 scope. The only real downfall of looking through the optic is its eye relief. Primary Arms specs the eye relief at 3.6 - 3.9”. So you really have to be in that 0.3” range to get a good eye box picture. Especially at those higher magnifications. I’m not using this on fast moving targets, so it doesn’t bother me much.
The Primary Arms 4-16x44 FFP has a few different reticle options. Some are their ACSS style, but I’ll be focusing on the ARC-2 reticle of this particular scope. I chose the ARC-2 MOA reticle because it is not cluttered up with stuff, like so many “christmas tree reticles” are. First off, the reticle is in minutes of angle, which is what I prefer. Second, it’s a first focal plane (FFP) reticle. So all the subdivisions, or hash marks, stay the same size throughout the magnification range. The reticle grows as you increase the magnification. This is so those marks in the reticle stay the same, and are usable for windage and elevation holdovers, at any magnification. On that note, Primary Arms did a nice job with this reticle. Almost all of the MOA marks are visible when at 16x. I’ve seen FFP optics that, a big portion of, the reticle disappears when at full magnification. The reticle itself is essentially just a crosshair with little marks spaced every 2 MOA apart. Every 10 MOA, there is a larger mark and a number, at least on the elevation portion of the reticle. Windage is a little different, with 2 MOA marks for the first 10 MOA, and then marks every 5 MOA past that. See the reticle picture for values. This reticle is very clean. It’s kind of old school mil-dot meets new school technology. Did I mention that the grid portion of the reticle is illuminated? Well it is, in red, with 11 brightness settings. I really like the style of simple and useful reticles like the ARC-2.
The ARC-2 is such a great reticle, but adjusting your scope is still very important. That brings us to the target style turrets on the 4-16x44. If you are into dialing your scope for windage and elevation adjustments, you want good target turrets. I found these to be repeatable, at least in my testing. If I dialed up 15 MOA, and then back down 15 MOA, it shot where I expected it to. I didn’t do a tracking test, But this isn’t a $1000+ scope, so I didn’t see any need for me to do that. The clicks on the turrets feel really good but you can’t really hear them. I prefer feel over hearing them anyway. They also have a little resistance to them, which is nice, so they don’t move if you bump them in the field. Each turret adjusts in 0.25 MOA/click and 15 MOA per 1 revolution of the turret. It has over 85 MOA of total adjustment, or about 6 full turns of the turret. L/R and UP are marked next to or under the turret, depending on which one it is. There is also a little mark to use for setting zero. The SLx 4-16 has the ability to set the turret dials to zero, after you have sighted it in. There’s 3 tiny set screws at the turret's top, loosen them and rotate the knob to zero. Tighten them back up and your zero is now set.
I have the Primary Arms SLx 4-16x44 mounted on a “varmint style” AR. The scope weighs in at 25 ounces. But in this case, it is the perfect scope for this particular rifle. The SLx has performed super well for me. It’s super clear for a scope in this price range. It’s easily adjusted, if needed. It has an illuminated reticle for low light use. A parallax adjustment that goes super low, so if I wanted to use it on something like a .22lr, I could. I wouldn’t hesitate to take this hunting in the brush. I think it would make an excellent hunting scope as the ARC-2 reticle doesn’t take up a lot of room in the scope. The magnification range is also great for this AR’s use case.
If you're in the market for a feature rich FFP optic, the Primary Arms SLx 4-16x44 ARC-2 might be it. I just can’t get over all the options you get in this optic, and at an incredible price. It performed better than my expectations for sure. The updated SLx scopes from Primary Arms are definitely worth checking out.
Firearms Insider Reviews - 8 Key Points
Claim to Fame:
Quality low priced FFP optic
Target Market:
Those wanting excellent quality in a mid range optic, but at a reasonable price
FNBs (Features & Benefits of this product):
First Focal Plane ARC-2 MOA reticle
Partial Red Reticle Illumination, Visible in Sunlight
11 brightness adjustments, including 2 that are Night Vision compatible
Side Parallax adjustment
Click Value: 0.25 MOA
FOV @ 4x / 100 yd : 26.6 ft
FOV @ 16x / 100 yd : 6.5 ft
Total Windage and Elevation Adjustment: > 85 MOA
Zero resettable turrets
Weight (with Battery, without Lens Covers): 25.4 oz
Tube Diameter: 30 mm
Eye Relief: 3.6 – 3.9 in
Fast Focus Eyepiece
Fog Resistant
Fully Nitrogen Purged, IP67 Waterproof Standard and Dust Proof
6063 Aluminum with Anodized Matte Black
Flip-up Lens Covers Included
Uses one CR2032 Battery (Included)
Lifetime Warranty
What other aesthetic options or finishes are available?
Tons in the SLx line
What others are saying?:
Nothing found as of this review
Link to other reviews:
Same - nothing found
Price point:
MSRP = $299.99
Retail = Same, but Primary Arms always has sales going on
I need it now! Availability:
Our Rating:
Pros:
Price
First Focal Plane reticle
Reticle options
Good Illumination
Clear field of view
Cons:
Non-forgiving eye box
Score: 8.50 Great
Favorite Link: SLx 1x Prism
Primary Arms is an advertiser on the Gun & Gear Review podcast. This does not give them a better review than any other company.
