New! Primary Arms SLx MD-21

Published on April 6, 2025
Duration: 9:43

This review of the Primary Arms SLx MD-21 red dot sight covers its specifications, features, and performance. The optic includes features like autolive technology, push-button controls, and an IPX67 waterproof rating. It underwent a rigorous water bottle durability test, demonstrating excellent zero retention and overall robustness, making it a strong contender in the budget optic market.

Quick Summary

The Primary Arms SLx MD-21 red dot sight offers excellent durability and features for its price, including autolive motion activation and an IPX67 waterproof rating. It passed a rigorous water bottle durability test, maintaining zero after multiple impacts, making it a reliable budget optic option.

Chapters

  1. 00:00Intro & Overview
  2. 01:12Introducing the Primary Arms SLx MD-21
  3. 01:55MSRP and Reticle Options
  4. 02:27SLx MD-21 Specs and Features
  5. 03:19Waterproof Rating and Design
  6. 03:40Heading to the Range
  7. 04:02Water Bottle Test Setup
  8. 04:26Confirming Zero
  9. 05:16Water Bottle Beatdown Begins
  10. 05:39First Shots After Beatdown
  11. 06:00Second Beatdown
  12. 06:40Third Beatdown
  13. 07:22Range Results & Analysis
  14. 07:30Durability Test Pass
  15. 07:55Post-Range Recap & Ammo Shoutout
  16. 08:30ACSS Multi-Reticle Design
  17. 09:20Final Summary & Recommendation

Frequently Asked Questions

What are the key features of the Primary Arms SLx MD-21 red dot sight?

The SLx MD-21 features autolive technology for motion-activated wake-up, large push-button controls, protected yet accessible turrets, an IPX67 waterproof rating, and a streamlined, anti-snag profile. It comes with an offset mount and spacer.

How durable is the Primary Arms SLx MD-21 red dot sight?

The SLx MD-21 underwent a rigorous water bottle durability test, where it was repeatedly struck to simulate G-forces. It maintained its zero throughout the test, demonstrating excellent resilience and robust construction.

What reticle options are available for the Primary Arms SLx MD-21?

The SLx MD-21 is available with either a simple 2 MOA dot reticle or the more advanced ACSS CQB multi-reticle system, which includes bullet drop compensation and range estimation features.

What is the price range for the Primary Arms SLx MD-21?

The standard SLx MD-21 with the 2 MOA dot has an MSRP of $160. Upgrading to the ACSS CQB reticle system increases the price to approximately $200.

Related News

All News →

More Reviews Videos You Might Like

More from 704 TACTICAL

View all →