SLx MD-21 ACSS CQB Reticle

The SLx Microdot 21mm Red Dot Sight brings modern innovation to a rugged, compact platform trusted by shooters around the world. Developed under Primary Arms’ SLx optics line, it delivers proven reliability with smart enhancements like AutoLive®, which preserves battery life by powering down during inactivity and instantly activating with motion.

Housed in a 7075-T6 aluminium body, the MD-21 features push-button brightness controls, 12 illumination settings, and is compatible with standard micro mounts using the Aimpoint® Micro footprint. Designed to handle real-world conditions and recoil, it’s ideal for Australian shooters running ARs, pump-action shotguns, or offset optics in demanding terrain.

Features:

• Autolive technology extends battery life
• Fully multicoated lens
• Top mounted push button controls
• Ultra bright ACSS-CQB reticle with 4 selectable modes
• Night vision compatibility
• Shockproof and waterproof aluminium construction
• Black anodized finish
• Includes Low mount and Absolute Cowitness mount with spacer (1.41" or 1.535" Height)
• Standard microdot footprint

The ACSS CQB reticle is engineered for speed, precision, and fast target acquisition. At its core is a 2 MOA red dot, surrounded by a bold horseshoe and subtle holdover points, allowing fast centre-mass aiming while also enabling distance estimation and ballistic holds. Unlike basic dot sights, the ACSS system gives shooters real feedback for both close and extended ranges, making it a practical choice for Australian landscapes—supporting fast transitions and extended-range awareness.