Primary Arms SLx MD-21 Microdot 21mm 2 MOA Red Dot Sight

The Primary Arms SLx MD-21 Microdot is a high-performance 21mm red dot sight engineered for serious CQB applications and everyday carry. Tipping the scales at just 5 ounces, this compact optic delivers an ideal balance of lightweight portability and battle-ready durability without compromising on precision.

At the heart of the MD-21 is an advanced LED emitter featuring a crisp 2 MOA red dot reticle, offering fast target acquisition and exceptional clarity across all lighting conditions. Full night vision compatibility makes this sight a versatile choice for both standard and low-light operations. The ultra-long battery runtime ensures your optic is ready when it counts, while Autolive™ motion-sensing technology automatically powers down the reticle after two minutes of inactivity and instantly reactivates the moment you pick it up—preserving battery life without sacrificing readiness.

Upgraded mounting hardware is included to guarantee rigidity and repeatable zero retention, so you can trust your point of impact shot after shot. For shooters requiring a higher cheek weld, night vision clearance, or a more heads-up sight picture, the compatible SLx 2.26″ Mount is available separately.

Key Features:
– 21mm micro dot form factor
– 2 MOA red dot reticle
– Lightweight at only 5 ounces
– Full night vision compatibility
– Autolive™ motion-activated on/off technology
– Ultra-long LED battery runtime
– Upgraded mounting hardware for secure, repeatable zero

Whether you’re building a competition AR, running a defensive pistol caliber carbine, or looking for a reliable optic upgrade, the Primary Arms SLx MD-21 delivers proven performance at a competitive price. Shop online at Deep Roots Rifle Co for fast shipping nationwide, or stop by our Eustis, Florida gun store to see it in person and get expert advice from our knowledgeable staff.