The Primary Arms SLx MD-21 is a 21mm microdot sight featuring the proven ACSS-CQB reticle and AutoLive motion-sensing technology. Designed for durability and speed, this optic delivers precision in close to mid-range scenarios, making it a top-tier choice for tactical, competition, and defensive applications.
Key Features:
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ACSS-CQB Reticle – Intuitive reticle for rapid target acquisition and ranging capabilities.
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AutoLive Motion Activation – Powers the optic on with movement and conserves battery during inactivity.
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21mm Objective Lens – Compact microdot housing optimized for low-profile rifle setups.
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12 Brightness Settings – Daylight bright with multiple night vision-compatible levels.
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Rugged Construction – IP67 waterproof rating and built to withstand field abuse.
Specifications:
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Manufacturer: Primary Arms
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Model: SLx MD-21 (PA-SLX-MD-21-ACSSPAO)
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Reticle: ACSS-CQB (Red)
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Magnification: 1x
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Objective Lens: 21mm
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Adjustment: 0.5 MOA per click
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Battery Life: Up to 50,000 hours (CR2032 battery)
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Construction: 6061-T6 aluminum
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Weight: Approx. 6 oz
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Mount Type: Industry-standard Microdot footprint
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Waterproof Rating: IP67
Recommended Uses:
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Tactical rifle setups
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Home defense and duty carbines
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Competitive shooting
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Airsoft or training platforms (if paired with replica)
The Primary Arms SLx MD-21 brings innovation and reliability together with its battle-ready build, motion-activated AutoLive function, and advanced ACSS-CQB reticle—giving you the edge in any high-speed engagement.
