Primary Arms SLx MD-21, Microdot, Black

Product Description

The Primary Arms SLx MD-21S microdot is a compact red dot sight engineered for shooters who demand precision and reliability. This 21mm objective optic mounts directly to Aimpoint Micro footprint rails found on modern rifles. The red illuminated reticle ensures fast target acquisition across various lighting conditions. Its anodized black finish provides exceptional durability and corrosion resistance for years of dependable performance.

Advanced ACSS CQB Reticle Technology

The ACSS CQB reticle is specifically designed for close-quarters scenarios and sporting applications. Furthermore, it offers multiple aiming points optimized for different ranges. The reticle balances speed with precision without obscuring your sight picture. Additionally, red illumination enhances visibility on dark targets and indoor environments.

Compact Design and Battery Performance

This microdot minimizes profile and weight on your firearm. Moreover, the red illuminated reticle operates for approximately two to four weeks on continuous setting. Therefore, typical users change the battery only once per year. The compact SLx MD-21S excels in home defense, sport shooting, and tactical training.

Built for Reliability and Field Testing

Primary Arms has built a reputation for producing optics that perform under demanding conditions. In addition, the SLx MD-21S undergoes rigorous quality testing before leaving the factory. This microdot will serve you faithfully through training, competition, and recreational field use. Furthermore, you receive a limited lifetime warranty against manufacturer defects.

Ordering from Western Sport

Order online and it ships straight to your door. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.

Frequently Asked Questions

Q: Does the SLx MD-21S fit my rifle?

A: Yes, this optic uses the Aimpoint Micro footprint found on most modern tactical carbines and sporting rifles. Additionally, it is compatible with AR-15s, AK-pattern rifles, and other firearms with standard Picatinny rails. Our staff can verify compatibility with your specific firearm before purchase.

Q: How long does the battery last on the red dot?

A: The red illuminated reticle operates for approximately two to four weeks on continuous setting. Therefore, most users replace the battery only once per year with standard recreational or sporting use. Battery replacement is simple and does not require professional service.

Q: What makes the ACSS CQB reticle ideal for sport shooting?

A: The ACSS CQB reticle provides multiple aiming points optimized for close-quarters and mid-range distances common in sporting applications. Moreover, it balances target acquisition speed with precision, allowing faster engagement without sacrificing accuracy. The design ensures clear sight picture and minimal target obscuration during competitive and recreational shooting.

Additional information