Click to see full view
Meprolight
Overview
The Meprolight M21 Day/Night Self Illuminated Reflex Sight features a 4.3 MOA dot size, providing a clear and precise aiming point for quick target acquisition. As a red dot optic, it is designed for versatility in various lighting conditions, ensuring visibility with its self-illuminated reticle that remains bright whether in daylight or low-light scenarios. This optic is commonly found in tactical builds where speed and accuracy are paramount.
Specifications
Meprolight M21 Day/Night Self Illuminated Reflex Sight - 4.3 MOA
Available Merchants(4)
Prices checked
Price Alert
Price and stock
The Meprolight M21 Day/Night Self Illuminated Reflex Sight - 4.3 MOA was hard to find in September 2026, in stock on only 5 of the 17 days we checked, and today 2 of the 4 retailers we track have it in stock. Prices barely moved in September 2026, holding around $429.99, so there haven't been real sales lately. Buying today, the lowest price is $429.99 at KY Gun Company, which matches the best price we saw in September.
Prices checked · refreshed daily across 37 retailers
Not sure which optic to pick?
We ranked every optic by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Red Dot & Optic Guide →Check it against the live catalog:
Frequently Built With
Popular alongside optics on GunPartPicker
Aero Precision M4E1 Complete Lower Receiver W/MOE SL Grip & SL-S Carbine Stock
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Magpul AR-15 MOE Stock Collapsible Mil-Spec Black
Bravo Company Manufacturing 5.56 NATO Mid-Length Bhf AR-15 Barreled Upper - MCMR-15 - 16"
Radian Raptor Charging Handle & Talon Safety Selector Combo - OD Green
Bravo Company M16 Bolt Carrier Group Black
No reviews yet. Be the first to review this product!