Meprolight M21 Day/Night Reflex Sight – Triangle Reticle with Dust Cover (30mm, Picatinny Mount)

The Meprolight M21 Day/Night Reflex Sight with Triangle Reticle delivers battle-proven, battery-free targeting performance for serious shooters and tactical operators. Engineered with self-illuminating tritium technology, this sight automatically adjusts to ambient light conditions — no batteries, no switches, no distractions. Just fast, reliable target acquisition in any lighting environment.

Built on a robust steel and glass construction with a 30mm lens, the M21 offers a wide field of view and a crisp triangle reticle designed for intuitive, both-eyes-open aiming. The quick-release Picatinny mount ensures a secure fit while retaining zero upon remounting — ideal for multi-role platforms that require optic swaps in the field. The included dust cover protects the lens when not in use, and the matte grey and black finish minimizes glare and blends with modern tactical setups.

Designed to work seamlessly in tandem with a magnifying scope, the M21 is a versatile choice for AR-15 platforms and Picatinny-compatible rifles. Meprolight backs the tritium illumination with a 10-year warranty, giving you long-term confidence in your investment.

**Key Features:**
– Battery-free, self-illuminating tritium reflex sight
– Triangle reticle for fast target acquisition
– 30mm diameter lens with wide field of view
– Both-eyes-open reflex aiming
– Quick-release Picatinny mount — retains zero when remounted
– Compatible with magnifying scopes
– Includes dust cover
– Matte black/grey steel and glass construction
– Tritium illumination warranted for 10 years
– AR-15 compatible

⚠️ **Restrictions:** This item cannot be shipped directly to California.

Order online today and experience the Meprolight M21 advantage — a no-compromise optic trusted by professionals worldwide. Questions? Contact our team for expert guidance on compatibility and setup.