If you’ve been running the Primary Arms SLx 1x MicroPrism and wishing you could swap it onto your existing red dot mount without buying yet another adapter, good news: Primary Arms heard you.
The Houston-based optics company just dropped the SLx 1x MicroPrismT — same prism, new footprint. Specifically, an H1/T1-compatible mounting footprint, which is about as close to a universal standard as the red dot world has. That means this thing drops right onto a massive selection of aftermarket mounts and risers you probably already own. No proprietary adapter. No extra spend. Just swap and go.
Same Great Optic, Smarter Platform
Everything that made the original MicroPrism a sleeper hit is still here: compact form factor, a generous eye box, and an etched reticle that functions whether your battery is dead or not. That last point matters more than people give it credit for. Prism scopes give you a usable reticle at zero power even when the electronics are cooked, which is something a standard red dot can’t claim. They also tend to produce a cleaner image for shooters with astigmatism — a legitimate advantage that often gets buried in spec sheets.
New Reticle Option Worth Noting
The MicroPrismT launches with the full existing reticle lineup — ACSS Cyclops and ACSS Gemini in red or green — but the addition worth flagging is the new T-Dot, Primary Arms’ first Red Dot Bright (RDB) reticle in a prism scope. It’s exactly what it sounds like: a bright center dot anchored by T-shaped stadia lines. Clean, fast, and uncluttered. If the ACSS reticles feel like too much for your use case, the T-Dot gives you a simpler option without sacrificing the etched reticle advantages.
Out of the box you get both a tall 2.26″ riser and a low mount included, so you’re not immediately reaching for your wallet to get to your preferred height.
The Bottom Line
At $299.99, the SLx 1x MicroPrismT sits in a smart price bracket — below the Trijicon MRO prism territory, above the budget-bin options that make you nervous about zero retention. For a 1x optic that bridges the gap between a true red dot and a magnified optic while now fitting the mount you already have, it’s a compelling update to an already solid platform.
Available now at primaryarms.com and through authorized dealers.
Primary Arms Optics was founded in 2008 and is headquartered in Houston, Texas. All products are hand-inspected and backed by a lifetime warranty.