{"product_id":"primary-arms-glx-md-21s-21mm-microdot-red-dot-sight-acss-cqb-reticle-autolive-810026","title":"Primary Arms GLx MD-21S 21mm Microdot Red Dot Sight ACSS-CQB Reticle AutoLive 810026","description":"\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eThe Primary Arms GLx MD-21S is a high-performance 21mm microdot red dot sight engineered for shooters who demand rapid target acquisition, durability, and precision from close-quarters to intermediate range engagements. As part of the Gold Line Optics (GLx) series, this optic combines tactical-grade construction with cutting-edge technology. At the heart of this sight is the ACSS-CQB reticle, which pairs a precise 2 MOA center dot with ballistic holdover references for immediate aiming solutions at any engagement distance. Constructed from rugged 7075-T6 aluminum with a matte black hardcoat anodized finish, the MD-21S is shockproof, IPX7-rated waterproof, and fog-resistant. The integrated AutoLive motion-sensing technology powers the optic on when movement is detected and shuts it off during idle periods, delivering up to 50,000 hours of runtime from a single CR2032 battery. Push-button controls, 12 brightness settings including 2 night vision-compatible levels, a multi-coated 21mm objective lens, a solar failsafe backup system, and compatibility with the Aimpoint T1\/H1 Micro footprint make this sight a versatile, mission-ready optic for AR platforms, shotguns, PCCs, and more.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eACSS-CQB Reticle with 2 MOA Center Dot:\u003c\/strong\u003e Provides ballistic holdover references and close-quarters aiming points for fast, accurate engagement from short to intermediate distances.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutoLive Motion-Sensing Technology:\u003c\/strong\u003e Automatically powers the sight on when motion is detected and off when idle, extending battery life to up to 50,000 hours on a single CR2032 battery.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e7075-T6 Aluminum Housing:\u003c\/strong\u003e Delivers superior impact resistance, shockproof integrity, IPX7-rated waterproofing, and a hardcoat anodized matte black finish for lasting durability in demanding conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e12 Brightness Settings with Night Vision Compatibility:\u003c\/strong\u003e Offers full adaptability across all lighting environments, including 2 dedicated night vision-compatible brightness levels.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Coated 21mm Lens with Solar Backup:\u003c\/strong\u003e Maximizes optical clarity while minimizing glare, and the integrated solar failsafe supplemental power system ensures reliable operation even under reduced battery conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Primary Arms Optics\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e GLx MD-21S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMPN:\u003c\/strong\u003e 810026\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 818500018285\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e 1x\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eObjective Lens Diameter:\u003c\/strong\u003e 21mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReticle Type:\u003c\/strong\u003e ACSS-CQB (2 MOA center dot + holdovers)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIllumination Color:\u003c\/strong\u003e Red\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrightness Levels:\u003c\/strong\u003e 12 (2 NV-compatible)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Type:\u003c\/strong\u003e CR2032 (included)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Life:\u003c\/strong\u003e Up to 50,000 hours\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHousing Material:\u003c\/strong\u003e 7075-T6 Aluminum\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Matte Black Hardcoat Anodized\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWaterproof Rating:\u003c\/strong\u003e IPX7\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 2.7 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e ~4.5 oz (without mount)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustment Click Value:\u003c\/strong\u003e 0.5 MOA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMount Compatibility:\u003c\/strong\u003e Aimpoint T1\/H1 Micro footprint\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.\u003c\/em\u003e\u003c\/p\u003e","brand":"PRIMARY ARMS OPTICS","offers":[{"title":"Default Title","offer_id":44199681392762,"sku":"FLX-197997","price":237.98,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1679\/0365\/files\/306285382.png?v=1788368159","url":"https:\/\/tlooutdoors.com\/products\/primary-arms-glx-md-21s-21mm-microdot-red-dot-sight-acss-cqb-reticle-autolive-810026","provider":"TLO Outdoors","version":"1.0","type":"link"}