Chad Wallace

July 28, 2025

Gear, Optics, Review

Primary Arms SLx RS-10R

Chad Wallace

July 28, 2025

Gear, Optics, Review

Primary Arms

SLx RS-10R Review

Primary Arms has come out with their new SLx RS-10R. This is an updated version of the original RS-10 reflex style red dot. One of the big complaints about the original was the mounting footprint it used. Well, the SLx RS-10R has fixed that issue.

As with the original, the SLx RS-10R is packed with features. More important than all of those is the “R” designation at the end of the model number. That “R” stands for RMR. I don't think Primary Arms can say it, but we can. What that means for you is that the RS-10R now uses a RMR footprint. Or a Holosun 407C/507C footprint since they are essentially the same. The only drawback to using the RMR footprint is that the RS-10R now uses the smaller cr1632 battery instead of a cr2032. But through some magic, you still get 25k-50k hours of battery life.

Now back to the rest of the specifications. The RS-10R runs a 3 moa dot. I find the dot size to be a good compromise, no matter if you mount it on a pistol or rifle. It has 11 brightness settings. Of which, the bottom 2 are night vision compatible. To adjust the brightness, the RS-10R has soft touch buttons on the left side. When you reach the highest brightness setting, the dot will flash so you know when the limit has been reached. You also don't have to worry about turning the RS-10R on or off. It uses Primary Arms’ “Autolive” technology. This tech automatically turns the optic off when it is stationary and then on when it senses movement. Worth noting is the RS-10R has 1 moa click adjustments that uses a flathead to adjust. One can even use the rim of a spent case to adjust it, which I have done before. No trying to find the correct allen wrench. These clicks are tiny, but way better than no clicks at all.

Window size in these small red dots can be hard to understand sometimes. Manufactures spec the window size out, but it doesn't take into account if it is rounded or squared. Or where it is rounded and squared. I recommended looking through them to see if you like the window shape. Even though the RS-10R doesn't have a huge window, it is very well shaped to pick up the dot easily. Primary Arms specifies it as 23x19mm. I really like the shape. It is easy for me to see. Other people who I asked about it said the same thing, it's easy to find the dot. Primary Arms also fixed the refresh problem on the RS-10R. The original RS-10 would “galaxy” out because the refresh rate was too slow. The RS-10R does not have this problem. The dot stays consistent when moved and doesn't flash.

The SLx RS-10R uses an aluminum housing. They use 7075 aluminum which is a little stronger than the commonly used 6061. I like how the housing sticks out farther than the lens, giving it a little more protection from drops. One drawback to the RS-10R's construction is the higher deck height of the mounting surface. It sits higher up than some red dots. This doesn't hurt anything, but you do notice it when installing taller iron sights.

I ended up mounting the RS-10R on the Fusion XF-Pro. The XF-Pro uses a mounting plate system. This leads to you noticing the RS-10R’s deck height even more. It didn’t bother anything and I can pick up the dot easily. The dot on the RS-10R is pretty clear, even with my astigmatism. What I really like about the RS-10R, besides being an RMR footprint, is the window. For some reason I just pick the dot up quickly with the way the window is shaped. I am glad Primary Arms updated the RS-10 to an RMR footprint and fixed the refresh problems. It performs great.

I know there are a million reflex pistol red dots on the market now, but the Primary Arms SLx RS-10R is a great option. You get a lifetime warranty. It has a side-loading battery with their “Autolive” on/off function. Plus it now features that RMR footprint everyone was asking for. If you are in the market for a pistol red dot, definitely go check out the new SLx RS-10R.

Firearms Insider Reviews - Key Points

Claim to Fame:

RMR footprint red dot

Target Market:

Anyone wanting a pistol style red dot with a RMR footprint

Features, Benefits, and Specifications of this product:

Battery Life: 25,001 - 50,000 Hours
Battery TypeCR1632 3V Lithium Coin
Side-loading CR1632 battery
Click Value: 1 MOA
Open Emitter
Finish: Hardcoat Anodized
7075 Aluminum construction
Mount Compatibility: Holosun 407C/507C, RMR
Night Vision Compatible
11 Brightness settings
23 x 19mm window
3 MOA Dot
Lifetime Warranty
Weight: 1.1 oz.

What other aesthetic options or finishes are available?

Original SLx RS-10

What others are saying?:

Nothing found as of publishing

Link to other reviews:

Beyond Seclusion on YouTube

Price point:

MSRP = $209.00

Retail = Same

I need it now! Availability:

Primary Arms, Midway USA, or your local gun store

Our Rating:

Pros:

RMR / Holosun 507c footprint
Click adjustments
Side loading battery
Autolive
Lifetime warranty

Cons:

Deck height

Score: 8.50 Great

Favorite Link: Fusion XF-Pro Review

Chad Wallace

April 12, 2019

Review

Rock Slide USA - RS2

Chad Wallace

April 12, 2019

Review

Rock Slide USA has come on the market with some pretty nice products. Of which is their Glock slides. The slides come in two different versions, with options available for both models. The model I received for review is their RS2, with a RMR cut, in black, for a Glock 17. This was a stripped slide, meaning it had no parts in it.

When I first opened the box, I was impressed. The machining was beautiful. As was the black coating. Rock Slide Cerakotes all of their slides, so this RS2 is black Cerakote. I immediately installed my Glock parts kit. All the parts went in like they should. Since this slide has a cut-out for an RMR, I proceeded to install my Holosun 507 as it uses a RMR mounting platform. I did notice that the 507 moved a tiny bit back and forth on the slide’s studs. The RS2 has studs that the red dot sight goes over and then the sight screws go into the studs. This movement was minor and didn’t cause any problems. The stud option allows for a tight fit without having to have a custom milled slide. So, I tightened down the Holosun. Rock slide also sent me a cover plate. I did put it on just to see how it fit. As expected, it fit and lined up great. They also make this slide with a Vortex Venom cut, for those wanting a less expensive sight.

Rock Slide did a nice job with the aesthetics also. Being that this is the RS2, it has vents cut out on the front of the slide. The RS1 does not have these. The vents are cut at an angle toward the rear. I also found that these vents are large enough to act as front slide serrations. Speaking of serrations, the ones on the rear are angled and sharp enough to give good grip. The slide is also beveled on top from the ejection port forward. It gives a distinct appearance and makes it not look so Glock like.

I mounted up the Rock Slide to a Polymer 80 frame. The slide was a nice snug fit without hardly any side to side or up/down play. It is also using a Faxon Firearms barrel which it also mated very nicely too. For the record, I did not install any iron sights on the RS2, but it does have the rear dovetail and front oval hole for standard Glock sights. This slide makes the handgun shoot great! Better than another slide I have used. So Rock Slide’s claim of better performance are spot on.

Ever since receiving the slide, I have shot this handgun more than any other. The RS2 runs smooth. I have shot it in a Speed Steel match with zero problems. Not counting the other times I have shot it at the range. I am very impressed with the accuracy and functionality of this slide. Plus I think it looks good.

Please go take a look at Rock Slide USA. This RS2 slide is great. Rock slide also manufactures barrels for these slides. The slides start at $200, with options to basically have a complete slide with sights and an optic! Different color options too. They are also made in the USA with a lifetime warranty.

Firearms Insider Reviews - 8 Key Points

Claim to Fame:

Precision machined Glock Slide

Target Market:

Pistol builders, Glock users that want a complete slide cut for a miniature red dot

FNBs (Features & Benefits of this product):

Tighter Tolerances
Made from 416R Stainless Steel
Cerakoted
Vented
Optional cover plate
Tapered - not square (adds a non-glock look)
RMR cut (optional Vortex Venom cut)

What other aesthetic options or finishes are available?

With or without optics cut and vents.

FDE, ODG, Burnt Bronze, Tungsten, Pink, Unfinished

What others are saying?:

Rusty M. - 5/5 stars at Rockslideusa.com

Top notch company!!! I received my slide within a couple weeks after ordering, it looked and ran great, unfortunately there was a small ridge on the chamber face that I didn’t even notice until I ran some rounds through it. It was just enough to slightly dent the fired case head, I reload my ammo or I probably wouldn’t have worried about it. I gave Rock Slide a call, they said no problem, sent a postage paid return label and I had a replacement slide within two weeks. The slide is flawless, the finish is awesome, it fits the frame great, looks and runs great. I had the venom sight cut which fits absolutely perfect. I couldn’t be happier with my purchase and the great customer service. I highly recommend Rock Slide USA to anyone who is looking for a quality custom slide. Check out the other products they offer too, I picked up a SilencerCo threaded barrel and extra mags for my Glock 17 and the pricing on everything is very reasonable.