Description
The MEPROLIGHT MEPRO M21 is an innovative, self-illuminated reflex sight, designed to provide unmatched tactical superiority. Originating from the Israeli Defense Force, this red dot sight is a result of advanced Meprolight® tritium technology, employed globally by militaries and law enforcement agencies.
The M21 is powered by fiber optics during the day and Meprolight® tritium at night, offering all-light aiming without the need for batteries. This seamless transition between systems ensures high contrast between the aiming dot and the target area, enabling optimal visibility in all light conditions. Its tritium luminance is warranted for ten years.
The sight boasts a wide 30mm diameter lens, providing a large field of view for rapid target acquisition. Its versatility is further enhanced with five different reticles – MOA or 5.5 MOA dot, Triangle, 4.3 Bullseye, and X – increasing your accuracy and speed under pressure.
Engineered to withstand harsh conditions, it meets rigorous MIL-STD-810 standards, proving its reliability in extreme weather conditions. Compatibility with Night Vision Goggles or scopes, including those with GEN III tubes and magnifying scopes such as the Mepro MX3F/T, adds to its functionality.
With no need for batteries or switches, the MEPRO M21 is always ready, making it a dependable choice for those in demanding tactical scenarios.
Meprolight Mepro M21 Features:
- DUAL ILLUMINATION SYSTEM: This sight takes advantage of ambient light during daylight using fiber-optics, and Tritium, a self-illuminating material, in low light or nighttime. The transition between the two systems is automatic and instantaneous, ensuring a clear and bright aiming dot in all lighting conditions.
- VARIETY OF RETICLES: Mepro M21 offers a selection of five different amber-colored reticles. You can choose between an MOA or 5.5 MOA dot, Triangle, 4.3 Bullseye, and X. These various options adapt to different tactical scenarios and enhance your shooting precision and speed.
- RUGGED AND ROBUST CONSTRUCTION: Crafted to meet the rigorous MIL-STD-810 standards, the Meprolight M21 sight exhibits impeccable performance in extreme weather conditions. This rugged, reliable design ensures durability and longevity, whether you're in a battlefield or a shooting range.
- NVG COMPATIBILITY: The Meprolight Mempro M21 sight is designed to be compatible with Night Vision Goggles and scopes, including those fitted with GEN III tubes and magnifying scopes like the Mepro MX3F/T. This compatibility ensures that your visibility and targeting accuracy remain uncompromised, even in low light conditions.
- LARGE FIELD OF VIEW: The sight features a large 30mm diameter lens, offering a wide field of view. This extensive view ensures rapid target acquisition, enhancing your accuracy and speed when firing under pressure. It increases your situational awareness, giving you an edge in tactical scenarios.
- BATTERY-FREE OPERATION: The M21 Red Dot is maintenance-free and doesn't require batteries to operate. It's always on and always ready, providing you with a hassle-free user experience and continuous performance, which is especially crucial in demanding tactical environments.
- LONG-LASTING LUMINANCE: The tritium luminance of the sight is warranted for ten years. This feature guarantees a bright and clear reticle, ensuring optimal visibility and accurate targeting in low-light and nighttime situations for a decade.
- MILITARY AND LAW ENFORCEMENT APPROVED: Tested and trusted by the Israeli Defense Forces and law enforcement agencies worldwide, the M21 Red Dot sight proves its reliability and effectiveness in real-world tactical situations. It's your companion for precision, speed, and accuracy in the most challenging conditions.
Meprolight Mepro M21 Technical Specifications:
| Attachment/Mount Type: | Picatinny |
| Condition: | New |
| Included Accessories: | Dust Cover |
| Magnification: | 1 x |
| Objective Lens Diameter: | 30 mm |
| Length: | 114 mm, 4.48 in |
| Weight: | 372 grain |
| Eye Relief: | Range 10 - 600 mm |
| Tube Diameter: | 1.17 in |
| Weather Resistance: | Yes |
| Color: | Black |
| Water Resistant Mark: | 1 m |
| Objective Aperture: | 27 mm |
| Illumination Type: | Tritium, Fiber Optics |
| Height: | 70 mm, 2.73 in |
| Width: | 2.22 in, 55 mm |
| Parallax: | 0.25 |
| W/E Travel at 100 Yds: | +/- 35 MOA |
| Adjustment Click Value: | 1.7 MOA |
| Lens Material: | Optical Glass |
| Lens Finish: | Polished |
| Fabric/Material: | Metal |
| Operating Temperature: | Range -40 - 131 Fahrenheit |
| Optical Coating: | AR Coating |
| Light Transmission: | 50 % |
| Water Resistance Level: | Waterproof |
| Illumination Color: | Red |
No batteries. No weakness. No surrender.
Self-illuminated and battle-proven reflex sight.
Originally developed for the Israel Defense Force (IDF), the Mepro M21 Red Dot Day/Night Self-Illuminated Reflex Sight represents the best of Meprolight® tritium technology and remains on active duty for the IDF and militaries and law enforcement worldwide.
A red dot sight with fiber-optic illumination by day, Meprolight® tritium by night, it takes charge of any field of battle with no need for batteries, ever. Its rugged, battle-proven construction meets or exceeds rigorous MIL-STD-810 standards to thrive in the harshest conditions, with five available reticles and a big 30-millimeter lens for maximum situational awareness.
Customer Questions & Answers
Will this work on 45 colt long rifle?
- If your rifle has a flattop upper receiver with an M1913 picatinny rail. If not, then you'll have to mount the optic over the hand guard with some different hardware.
Would this handle recoil from a 12g ok?
- It probably would but it is really not designed for use with a shotgun.
I live in a dark area w/ few lights. With the Night Reflex part of the sight; how well do you see in complete darkness, full moon & suburbs w/ lights?
- The dot will show in almost total darkness but unfortunately your target will not. But the m21 is awesome when paired with a night vision scope like a PVS-14. The dot is bright but not too bright and needs no special setting for night vision like some other red dots.
How long does the tritium last and is it replaceable? If so, how much does that cost?
-
Mepro claims 12 years but in my experience you can expect 9 to 10 years of life from the tritium vial. Yes, you can send it in to Mepro for replacement. I can't tell you how much it costs or what turnaround time is though.
If you buy this optic get the 4.3 MOA dot. Don't get any of the other reticles. They are too big.
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Optics Knowledge Center
Understanding Rifle Scope Basics
Magnification
Magnification refers to how much larger an object appears through the scope compared to the naked eye. Fixed power scopes have one magnification setting, while variable power scopes offer a range (e.g., 3-9x).
Objective Lens
The objective lens is the front lens that gathers light. Larger objective lenses (measured in mm) gather more light, providing brighter images in low-light conditions but add weight and require higher mounting.
Reticle
The reticle (crosshair) is the aiming point inside the scope. Modern scopes offer various reticle designs, from simple duplex crosshairs to complex ballistic reticles with holdover points for different distances.
Adjustments
Rifle scopes have turrets for windage (horizontal) and elevation (vertical) adjustments. These are measured in MOA (minutes of angle) or MRAD (milliradians) and allow precise aiming adjustments.
Proper Scope Mounting Guide
Select the Right Rings & Base
Choose rings that match your scope's tube diameter (typically 1", 30mm, or 34mm). Select a base compatible with your rifle's receiver. For heavy-recoiling rifles, opt for stronger mounts.
Install the Base
Clean the receiver and base thoroughly. Apply a small amount of blue Loctite to the screws. Attach the base to the receiver and torque the screws to manufacturer specifications.
Attach the Rings
Attach the bottom halves of the rings to the base. Place the scope in the rings and loosely attach the top halves. Don't fully tighten yet.
Set Eye Relief & Level
Position the scope for proper eye relief (3-4 inches) in your normal shooting position. Ensure the reticle is level using a scope leveling tool. Once positioned correctly, tighten the rings evenly in a cross-pattern.
Scope Zeroing Tips
Start Close
Begin zeroing at a shorter distance (25-50 yards) to ensure you're on paper before moving to your desired zero distance (typically 100 yards).
Use a Stable Rest
Always zero your rifle from a stable shooting position using a bench rest, sandbags, or a shooting rest to eliminate as much human error as possible.
Fire Groups
Fire 3-shot groups before making adjustments. This provides a more accurate representation of where your rifle is shooting than single shots.
Make Deliberate Adjustments
Know your scope's adjustment values (typically 1/4 MOA per click). If your group is 2 inches low at 100 yards, you'll need to adjust up 8 clicks (for a 1/4 MOA scope).
Confirm Your Zero
After making adjustments, fire another group to confirm your zero. Repeat the process until your point of impact matches your point of aim.
Document Your Settings
Once zeroed, record your settings including distance, ammunition used, and environmental conditions for future reference.
Optics Maintenance & Care
Cleaning Lenses
- Start by blowing or brushing away loose particles
- Use a lens pen or microfiber cloth for fingerprints
- For stubborn dirt, use lens cleaning solution (never household cleaners)
- Clean with gentle circular motions from center outward
Protecting Your Optics
- Always use lens caps when not in use
- Store in a dry place with silica gel packets
- Avoid extreme temperature changes
- Use a quality scope cover in harsh conditions
Regular Maintenance
- Check and tighten mount screws periodically
- Inspect O-rings and seals for damage
- Verify zero after rough handling
- Clean the exterior with a damp cloth
What to Avoid
- Never use fingers to touch lenses
- Avoid paper products (tissues, paper towels) on lenses
- Don't use acetone, alcohol, or household cleaners
- Never disassemble your scope (voids warranty)