Meet the New GLx and SLx Optics With ACSS or Red Dot Options

Primary Arms is back at it again, bringing innovation and versatility to the red dot market with the latest additions to their GLx and SLx optics lineup. This launch introduces four new micro red dot options, each tailored to meet the needs of shooters looking for reliability, precision, and smart features—without breaking the bank.

Whether you’re after a top-tier premium optic or a budget-friendly workhorse, these new offerings deliver. With two tiers—the high-performance GLx and the more affordable SLx—and two reticle choices, including the highly regarded ACSS CQB reticle and a standard 2 MOA red dot, there’s something here for every shooter.

Let’s break down what these optics bring to the table and which one might be the right fit for your setup.

GLx ACSS vs. SLx ACSS

The ACSS CQB reticle has become a fan favorite for good reason—it’s one of the most intuitive reticle designs on the market, giving shooters instant target acquisition at close quarters while still offering bullet drop compensation (BDC) out to 600 yards. Now, Primary Arms is bringing that same technology into a compact red dot platform with the GLx ACSS and SLx ACSS.

GLx MD-21 ACSS ($219) – The Premium Performer

If you’re looking for a high-performance red dot that packs in cutting-edge tech, the GLx ACSS is the way to go. Designed with solar failsafe technology, this optic can run even if your battery gives out, ensuring you’re always ready. Autolive technology extends battery life by shutting off the reticle when the optic is motionless for two minutes and instantly powering back on when you pick it up.

Beyond the tech, you get a fully multicoated lens, an ultra-bright emitter, and intuitive push-button controls for quick adjustments. The optic is shockproof, waterproof, and built from rugged aluminum, making it a solid choice for hard-use applications. Plus, with night vision compatibility, it’s a true all-condition performer.

SLx MD-21 ACSS ($199) – Maximum Value, Minimal Compromise

If you want the ACSS CQB reticle at a more wallet-friendly price, the SLx ACSS delivers. Weighing in at just 5 ounces, it’s a lightweight yet durable red dot that still brings Autolive technology and night vision compatibility to the table.

While it lacks the solar failsafe of the GLx model, it maintains the same BDC, auto-ranging, and wind hold features that make the ACSS reticle so effective. The controls are top-mounted instead of side-mounted, but the optic remains shockproof, waterproof, and built to withstand serious use.

For shooters looking for a battle-proven reticle without the premium price tag, the SLx ACSS is a strong contender.

GLx Red Dot vs. SLx Red Dot: Simple, Effective, and Affordable

Not everyone needs a reticle with BDC and ranging features—sometimes, a 2 MOA red dot is all you need. That’s where the GLx Red Dot and SLx Red Dot models come in. These optics strip things down to a simple, ultra-bright dot designed for rapid target acquisition and no-fuss shooting.

GLx MD-21 Red Dot ($199) – Built for Performance

Much like its ACSS counterpart, the GLx Red Dot comes with solar failsafe and Autolive technology, giving you extended runtime and reliability. The 2 MOA dot provides a crisp aiming point, while the fully multicoated lens ensures clarity in all lighting conditions.

Controls remain side-mounted for easy access, and the optic is shockproof, waterproof, and night vision compatible. If you want a premium, no-frills red dot that can go the distance, the GLx Red Dot is a fantastic option.

SLx MD-21 Red Dot ($159) – A Workhorse at the Right Price

For shooters on a tighter budget, the SLx Red Dot offers many of the same benefits but at a lower cost. You still get Autolive technology, night vision compatibility, and a bright 2 MOA dot, but without the solar failsafe of the GLx model.

The controls are top-mounted instead of side-mounted, and while the lens quality is still solid, it’s not as refined as the GLx version. That said, for $159, it’s one of the best budget-friendly red dots on the market.

Which One Should You Choose?

• If you want the best technology and features, go with the GLx ACSS ($219) for the advanced reticle or the GLx Red Dot ($199) for a simple but premium red dot experience.

• If value is your priority, the SLx ACSS ($199) gives you the ACSS reticle without breaking the bank, while the SLx Red Dot ($159) is one of the best budget micro dots available.

No matter which model you choose, Primary Arms continues to deliver feature-packed optics at competitive prices. Whether you’re a casual shooter, home defender, or professional user, these new optics offer something for everyone—without compromising on quality.

Where to Buy

All four models are now available at Primary Arms and authorized retailers. If you’re in the market for a new red dot, this lineup is definitely worth a look.