The Meprolight M-21 is a maintenance-free, self-illuminated reflex sight designed for rapid, instinctive aiming in a wide range of light conditions. It uses a fiber-optic collector for daylight illumination and a self-powered tritium element for night use, eliminating the need for batteries. The sight features a large 30 mm objective window for fast target acquisition with both eyes open and a Bullseye reticle measured at 4.3 MOA. A Picatinny adapter is included for mounting to MIL-STD-1913 rails.
Key Specifications
- Magnification is 1x for true reflex sight operation.
- The objective diameter is 30 mm to provide a large viewing window.
- The reticle is a 4.3 MOA Bullseye Dot for quick, centered aiming.
- Dot size is 4.3 MOA as specified by the manufacturer.
- Overall length is 4.48″ as listed in the product attributes.
- Weight is 13.12 oz for a balance of durability and minimal added mass.
- Finish is Black for low-visibility, matte appearance.
- Eye relief is listed as Unlimited for unrestricted head position.
- Windage and elevation are adjustable to zero the sight.
- Includes a Picatinny rail adapter for MIL-STD-1913 compatibility.
Built for reliable, no-batteries operation, the M-21 is well suited for close-quarters tasks where rapid target acquisition and both-eyes-open shooting are priorities. Its dual illumination system provides consistent visibility across lighting conditions, while the compact footprint and Picatinny mount make it a practical choice for a wide range of platforms and applications.
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