Primary Arms SLx MD-21 Push Button 21mm Microdot 2 MOA

The Primary Arms SLx MD-21 Microdot is designed to provide fast target acquisition and reliable optic performance for rifles and carbines. Built within the SLx optics line, this compact red dot combines lightweight construction with durable housing suitable for demanding shooting environments.

The optic features a precise 2 MOA red dot reticle that allows accurate aiming while remaining quick to acquire during rapid engagements. The 21mm objective lens and fully multi-coated glass help maintain a clear sight picture and improved target visibility in a wide range of lighting conditions.

LED illumination provides multiple brightness settings, allowing the reticle to remain visible in both bright daylight and low-light environments. Integrated AutoLive technology automatically powers down the optic when it remains still and instantly activates the reticle when movement is detected to help conserve battery life.

Constructed with durable aluminum housing, the MD-21 is built to withstand field use while maintaining dependable performance. The push-button brightness controls allow easy adjustment while the optic mounts using the widely supported Aimpoint Micro style mounting pattern.

Key Features

• 2 MOA red dot reticle for fast target acquisition
• 21mm objective lens for improved viewing window
• AutoLive motion sensing technology for battery conservation
• Push-button brightness controls for simple operation
• Durable aluminum construction for reliable field performance

Manufacturer Specifications
Magnification: 1X
Reticle: 2 MOA Red Dot
Objective Lens Diameter: 21mm
Brightness Settings: Multiple illumination levels
Night Vision Compatible: Yes
Battery Type: CR2032
Adjustment Value: 1/2 MOA
Mount Pattern: Aimpoint Micro footprint
Construction: Hardcoat anodized aluminum

FAQ

What is the MD-21 designed for?
It is designed as a compact red dot optic for rifles, carbines, and firearms with compatible mounts.

What does AutoLive technology do?
AutoLive automatically powers down the reticle when the firearm remains stationary and reactivates it when movement is detected.

What reticle does this optic use?
It uses a 2 MOA red dot reticle for fast and precise aiming.

What mounting pattern does the MD-21 use?
The optic uses the Aimpoint Micro style mounting footprint.

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