The Primary Arms SLx MD-21S is a lightweight 1X micro red dot with an ACSS CQB reticle and a 21mm objective, engineered for close-quarters use and fast target acquisition. Rugged construction and upgraded mounting hardware enhance stability.
The Primary Arms SLx MD-21S is an advanced micro red dot sight designed for fast target acquisition in close-quarters environments. It delivers a 1X optical system with an ACSS CQB reticle and a 21mm objective while remaining lightweight and durable. The sight includes upgraded mounting hardware intended to maintain rigidity and repeatable zero under routine use.
Common applications include close-quarters shooting and tactical training or competition stages that prioritize rapid transitions and sight picture clarity. The SLx MD-21S is intended for users who need a compact, low-profile non-magnified optic for dynamic scenarios.
Product Specifications
The reticle is ACSS CQB.
The product type is classified as a Red Dot.
The subcategory listed is Red Dot Sights & Non-Magnified Optics.
The optical power is 1X.
The objective measures 21mm.
The model designation is SLx.
The color finish is Black.
The manufacturer is Primary Arms.
The unit weight is listed as 5 ounces in the product description.
The sight is described as having upgraded mounting hardware for increased rigidity.
The intended magnification is 1X for non-magnified use.
The optical format is a micro red dot sight.
The UPC is 818500018261.
Compact and purpose-built, the SLx MD-21S offers a minimal profile and proven reticle geometry for rapid engagement and intuitive holdoffs. Its combination of light weight, robust mounting, and a CQB-focused reticle makes it suitable for shooters who prioritize speed and simplicity in dynamic environments.
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