Meprolight M21 Bullseye Reflex Sight with Picatinny Quick-Release Adapter – Self-Illuminated Tritium Reticle

The Meprolight M21 Bullseye is a self-illuminated reflex sight designed for rapid target acquisition in variable lighting conditions. Powered by tritium and fiber optic technology, this sight requires no batteries and provides a clear aiming point from dawn to dusk. The bullseye reticle configuration offers an intuitive aiming reference for close to mid-range engagement, making it effective for defensive shooting, tactical applications, and dynamic shooting sports.

Built with a forged aluminum housing, the M21 is waterproof and shockproof to military standards. The included Picatinny quick-release adapter allows for tool-free mounting and maintains zero through repeated installations. The sight offers unlimited eye relief and a wide field of view for both-eyes-open shooting. Tritium illumination is visible in complete darkness and transitions to fiber optic in daylight without manual adjustment.

• Type: Reflex Sight
• Magnification: 1x
• Reticle: Bullseye (Tritium/Fiber Optic)
• Illumination: Self-Illuminated (No Batteries Required)
• Mounting: Picatinny Quick-Release Adapter Included
• Eye Relief: Unlimited
• Housing Material: Forged Aluminum
• Waterproof/Shockproof: Yes (Military Standard)
• Operating Temperature: -40°F to 140°F
• Weight: Approximately 4.4 oz (sight body)