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Customer Reviews
Most Recent Reviews
great sight, always on by Ozark Twister, Verified Owner, August 8, 2025
The site is awesome and works very well. Literally zeroed in out of the box on my AR platform. I ordered the 4.3 bull’s-eye and love it. Grouping’s are very tight at 50 to 100 yards. Only drawback is if you’re shooting from a dark covered area out in...
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Most Recent Reviews
I tried very hard to like this sight by Mike, Verified Owner, December 8, 2024
Good things: holds zero, durable construction, great reticle, easy to range, easy to zero, good glass, no batteries. Not so good things: reticle can disappear in certain conditions. The best example I can give is shooting this on a range at 4pm in ...
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0/1 found this helpful
Most Recent Reviews
Specific use case by Madmanstan, Verified Owner, January 22, 2025
The irons sights are no more usable in the night than in the day. The main optic does work as intended, but is not usable when aiming into a brighter area like from inside to outside. The reticle gets completely washed out. The optic is sturdy and bu...
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0/1 found this helpful
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Product Discontinued by Manufacturer

Meprolight M21 1x30mm Reflex Red Dot Sight and Fubs Self-Illuminated Flip Backup Sight has been discontinued by Meprolight and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Red Dot Sights & Accessories, Red Dot Sights yourself to try and find the perfect replacement for you!

Product Info for Meprolight M21 1x30mm Reflex Red Dot Sight and Fubs Self-Illuminated Flip Backup Sight

M21 1x30mm Rifle Sightimage

Originally developed for the Israel Defense Force, the Mepro M21 Red Dot Day/Night Self- Illuminated Reflex Sight represents the best of Meprolight tritium technology and remains in active duty for the IDF, militaries and law enforcement agencies worldwide.

A red dot sight with fiber-optic illumination by day, Meprolight tritium by night, it provides the advantage on any battlefield with no need for batteries, ever. Its rugged, battle-proven construction meets or exceeds rigorous MILSTD- 810 standards to thrive in the harshest conditions.

With a large field of view through a 30mm diameter lens and 4 amber color reticles options available (4.3 MOA dot,Triangle, 4.3 Bullseye, and Open X) the Mepro M21 sets the standard of the terms of Always on, Always ready.

Fubs Self-Illuminated Flip Backup Sight

The Mepro FUBS is a tritium-enhanced set of sights two tritium vials are firmly inserted in the rear sight, and one tritium vial is inserted in the front sight. In addition, the self-illuminated backup sights are designed to provide the shooter with secondary sights if the primary optics go down.

The advanced Mepro FUBS sights are low-profile, made of strong composite material, and are highly durable. Quickly and easily flip them into position when needed. Sight pin elevation is easily adjusted without tools.

Day or night, the tritium makes the Mepro FUBS a viable option.

The MEPRO FUBS flip-ups are advanced, low-profile self-illuminated front and 2-Dot rear backup tritium sights -designed to provide a secondary sighting solution in case the primary optics go down. You can also use it as primary sight. The Mepro FUBS sights are mounted to any Picatinny rail using a 2.5mm Hex key (provided).

Features of Meprolight M21 1x30mm Reflex Red Dot Sight and Fubs Self-Illuminated Flip Backup Sight:

  • GETTING ON TARGET: The MEPRO FUBS offer the most reliable illumination for day or night. Premium grade tritium vials make your FUBS visible in low light and nighttime conditions. Both rear and front tritium sources appear green in lowlight and nighttime. The nighttime illumination is designed bright enough to see them but not too bright to impact the sight picture. Always producing light and always ready 24/7 for 12 Years.
  • HIGH DURABILITY: The fiberglass reinforced polymer and metal construction of the sights houses the high-grade tritium vial which provides illumination, allowing you to engage targets day or night confidently. A spring-based locking mechanism allows you to flip them into place when needed quickly.
  • EASY TO ADJUST: The detent knob on the rear easily adjusts windage, and the front sight includes an Indexed, easy-to-adjust Elevation Drum. No tools are required for zeroing.

Package Contents:

  • Meprolight M21 1x30mm Reflex Red Dot Sight and Fubs Self-Illuminated Flip Backup Sight

Red Dot Accessories

1–60 / 60
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Red Dot Sight Magnifier

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Red Dot Sight Mounts

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Related Products to Meprolight M21 1x30mm Reflex Red Dot Sight and Fubs Self-Illuminated Flip Backup Sight

Meprolight M21 1x30mm Reflex Red Dot Sight and Fubs Self-Illuminated Flip Backup Sight Unavailable & Discontinued Models

List of Unorderable Models

  • Meprolight M21 1x30mm Reflex Red Dot Sight, Triangle and Fubs Self-Illuminated Flip Backup Sight, 56263410 , MPN: 56263410 , UPC: 810013525427 , Code: MR-RD-UJK1Q-56263410
  • Meprolight M21 1x30mm Reflex Red Dot Sight, 4.3 MOA BullSeye and Fubs Self-Illuminated Flip Backup Sight, 56263110 , MPN: 56263110 , UPC: 810013525403 , Code: MR-RD-UJK1Q-56263110
  • Meprolight M21 1x30mm Reflex Red Dot Sight, Open X and Fubs Self-Illuminated Flip Backup Sight, 56263610 , MPN: 56263610 , UPC: 810013525434 , Code: MR-RD-UJK1Q-56263610
  • Meprolight M21 1x30mm Reflex Red Dot Sight, 4.3 Moa Dot and Fubs Self-Illuminated Flip Backup Sight, 56263210 , MPN: 56263210 , UPC: 810013525410 , Code: MR-RD-UJK1Q-56263210
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