Meprolight® M21 Polarizer and Flash Guard Kit – 5626090000
The Meprolight M21 Polarizer and Flash Guard Kit (5626090000) is a mission-essential accessory package for users of the legendary Mepro M21 Self-Illuminated Reflex Sight. While the M21 is world-renowned for its battery-free, tritium/fiber-optic operation, certain high-glare environments or tactical scenarios require additional light management. This dual-purpose kit (840103159904) provides the tools necessary to maintain a clear reticle in washout conditions and maintain a low profile in the field. Both components are 2026-spec genuine Meprolight factory parts, designed for a precision snap-fit onto the objective end of your M21 optic.
The Polarizer is a critical solution for "washout," a phenomenon that can occur when aiming from a dark room into a brightly lit outdoor area. By rotating the polarizer, the shooter can manually adjust the brightness of the target background relative to the reticle, ensuring the aiming point remains sharp and visible regardless of the lighting contrast. The Flash Guard (KillFlash) utilize a high-density honeycomb lattice to eliminate objective lens glint and reflections. This is a vital feature for 2026 tactical environments, as it prevents sunlight from reflecting off the glass and giving away the shooter’s position. Together, these accessories transform the M21 into a truly all-environment combat optic.
Includes: (1) Rotating Polarizer Filter and (1) Honeycomb Flash Guard (KillFlash).
Key Features
- Washout Prevention: The rotating polarizer allows for manual adjustment of the sight picture to prevent the reticle from disappearing against bright backgrounds.
- Honeycomb KillFlash: Dramatically reduces objective lens reflection, protecting the user from visual detection by opposing forces.
- Tool-Less Installation: Both components are designed to snap securely onto the M21 housing in seconds without the need for tools or permanent modifications.
- Extreme Durability: Constructed from high-impact polymers and aircraft-grade materials to match the ruggedness of the M21 optic itself.
- Enhanced Optical Clarity: The polarizer improves target contrast in high-glare conditions, such as over water, snow, or direct sunlight.
- Official Meprolight Accessory: Factory-guaranteed fitment for all Mepro M21 models (Triangle, Bullseye, Open X, and Dot reticles).
Product Specifications
- Brand: Meprolight USA
- Model: M21 Polarizer & Flash Guard Kit
- SKU: 5626090000
- Compatibility: Meprolight M21 Reflex Sight
- Materials: High-Impact Polymer / Optical Glass
- Finish: Matte Black
- Weight: 1.6 oz
- UPC: 840103159904
