Meprolight M21 dual-illuminated Reflex Sight

[ Written by gun optics guru Timothy Yan ]

With combat experiences from five major wars and concurrent anti-terrorism operations since its founding in 1948, the Israeli Defense Forces or IDF is one of the first military to understood the advantage of reflex sight on small arms for every infantryman. The main reflex sight used by the IDF for the last 20 plus years is the Meprolight M21. It features the always-on dual-illumination by fiber optic collectors during the day and it uses tritium illumination for low light and nighttime.

The Mako Group is the authorized distributor of Meprolight rifle sights in North America. I had a chance to try out a Meprolight M21 reflex sight during an Israeli style carbine course offered by Mako Defense, a sister company of the Mako Group.
The version that I tried has the “X” reticle. The M21 is also available with the 16 MOA triangle reticle, 4.3 MOA dot, 5.5 MOA dot and the bullseye (a dot inside of a circle). The tritium lamp has a 10-year guarantee by Mako. It typically lasts up to 14 years before the tritium became unusable. The tritium illumination unit is replaceable by factory service for a reasonable cost. The current production model is actually the Mepro M21m. The –m suffix is for modular design and because of that, every component on the M21m is replaceable and upgradeable. When mounted on an AR15 flat-top, the M21 has lower 1/3 co-witness with iron sights.

The M21’s reticle has an amber color and its 30mm objective lens’ coating has a green color tint to it. Under the bright daylight, the green lens coating is hardly noticeable. As the light becomes dimmer, the green color appears greener. Since human eyes are more sensitive to the green color, by using a green lens tint it helps to increase the optical contrast and makes the reticle stands out. On a reflex sight design, using the green color coating is a common technique to compensate for a dim reticle. In the M21’s case is its tritium lamp. The majority of the M21’s fiber optic collectors are located in the front of the sight with some in small windows in a horseshoe like pattern around the sides and the top. All the fiber optics is behind protective translucent panels with a discreet light grey color.

I found the M21’s amber color reticle works fine in daylight in both the desert and foliage environments and it is adequate in the darkness. The reticle is also sharply focused and without blooming. However, like other fiber optic and tritium lit sight, it has some issues in certain light conditions. The illumination is barely visible in the low interior lighting of a house. Where neither the fiber optic collects enough light nor the tritium lamp is bright enough. According to the Israeli technique, if you can see the target through the objective lens tube, you will hit it at close range. Another oddity is that in a very bright sunny day, if the shooter is in the shadow of a building and looking through the M21, sometime a bright background would washout the reticle. Although the M21 is less prone to that than the Trijicon reflex sights because it has some of its fiber optics on the sides. Not that the M21 is bad, in fact it works beautifully in most light conditions. Just remember that the fiber optic light collector technology has its limitation.

The M21’s tritium illumination is night vision compatible and it has less blooming than other tritium sights through the NVG. The company gets the tritium from the same Swiss manufacturer that also supplies Trijicon. According to Mako, the main difference is that Meprolight only buys the raw tritium instead of having the Swiss to build the whole illumination unit like Trijicon. Meprolight applies their proprietary treatments to the raw tritium before packaging it and also use higher quality focus lens in their tritium tubes.

The Meprolight M21 was specifically developed according IDF’s requirement. The sight has to be tough enough to withstand the punishment by 18 years old conscripts. The IDF is expecting the M21 to last for at least 20 years of hard use. The sight uses no battery, has no external switch, it’s always on and ready to use. The M21’s aircraft grade aluminum housing is sealed against the environment and it’s waterproof. Both the windage and elevation adjustment dials are flush mounted. The M21 features an adjustable QD mount with dual QD levers for mil-spec 1913 rail. Interestingly, the IDF had actually tested the various QD levers on the market. They have found that while the cam types like LaRue and ARMS are better for retaining zero, the cross bolt type that is on the M21 has more tolerance for mishandling. Mako also offers the M21 with a co-witness M16 carrying handle mount. Noted that the user can’t switch out the mount, it’s factory calibrated to the sight’s lens and it’s permanently installed.

At $560 MSRP, the Meprolight M21 is not a cheap sight. However, the included adjustable QD mount base is worth at least $100. The retail package also comes with a handy elastic neoprene sight cover and a fabric storage pouch. The M21 is comparably priced to Trijicon’s dual illuminated 1x24mm reflex sight with QD mount and it’s cheaper and lighter than the Trijicon 1x42mm model. In term of durability, I rated the Meprolight M21 on the same level as the top-end Aimpoint M4 and the EOtech 553. Both of those cost $100-$200 more and weight double of the M21’s 8-ounces weight.

Source: The Mako Group (631) 880-3396

Steve Johnson

Founder and Dictator-In-Chief of TFB. A passionate gun owner, a shooting enthusiast and totally tacti-uncool. Favorite first date location: any gun range. Steve can be contacted here.


  • Abe Froman

    Once again a great article. I have to ask, did I see one of your articles in Guns and Ammo’s AR special? Or did that person go to the same IDF carbine course?

    • Komrad

      I have that article here. It was written by James Tarr, not Timothy Yan.

      Strangely, despite costing $500 or so, he described it as a budget optic.

      • Frank

        Well, $500 for a military grade optic really isn’t that expensive.

      • Komrad

        That’s half the cost of a decent AR and the whole cost of a good AK (home conversion of a Saiga).
        I’m not saying it’s not a good deal, but I thought it was funny listing it as budget.

        Also, I just realized the article I had is Shotgun News. Don’t know how I screwed that up.

    • Timothy Yan

      I wrote the IDF carbine course and IDF style AR-15 setup article for the latest issue of Guns & Ammo: Book of the AR-15.

  • Daniel

    Dudes, please fix your mobile site!!! All the pics are not sized to fit, they extend off the screen. The site would be better without a mobile theme at all.

  • Nadnerbus

    “Meprolight applies their proprietary treatments to the raw tritium before packaging it”

    Does this treatment somehow extend the half life? =P

    I know nothing of the process, but that kinda sounds like marketing to me. Is there something more to this?

    • It has to do with limitations put on the import of tritium light sources by US law, and really noticeably affects pistol night sights. US companies are limited in how much tritium can be imported in a single tube. Meprolight is not restricted in this way and receive light sources in a different configuration and use unique processes to cut the tubes, as well as the methods of installing the tubes and lenses in sights. The difference can be seen in the Meprolight pistol night sights.

    • My limited understanding of physics is that you can’t by definition alter the half life of a isotope (without actually changing the isotope into a different isotopes), but I could be wrong.

      • I think you are basically correct, however, the purity of the tritium matters, and the way it is handled. So you cannot really increase the half-life, but it can be decreased in usefulness. Some tritium night sight manufacturers in the US use a tritium supplier that has a very large failure rate (I’m not talking about Trijicon or anyone supplied by Trijicon, of course.)

  • Pietro

    This is a Swiss compay that produces tritium light sources.
    I don’t know how many companies do this, my knowledge is very limited. Still, once the tritium gas is inserted in the transparent container, I think that the only thing another manufacturer can do is to change the “environment” where the light source is mounted.
    I know I’m not very clear, but I don’t understand the thing of buying “raw” tritium.

    • Komrad

      Maybe put tints or treatments on the tube?

  • Jeff

    By buying raw tritium, does this mean they buy tanks of it, and fill their own tubes?

    • I don’t want to go into great detail here, but the tritium is purchased in long tubes and then Meprolight cuts the tubes to length and installs it in protective tubes with lenses for the particular application. The process used by Meprolight results in the purest tritium used in sights, and brighter sights.

  • JJ

    Can anyone tell what brand hand guard that is in the first pic?

  • SGB

    It’s a budget optic. As in there goes the budget. But it looks nice.

    • It is not a budget optic. It is a MIL-SPEC night vision-compatible reflex sight that is standard issue to the IDF and other forces around the world. It may be less expensive than most MIL-SPEC optics and definitely less expensive that similar systems, but it is definitely not a budget optic. It is actually a very advanced, high-end optic.

      • Fortstring

        Lol you may want to re-read his post 🙂

      • I did read it – someone said a reviewer said it was a budget sight – I was simply agreeing that it is not meant to be a budget optic.

  • Joe Schmoe

    Good article.

    Having used the Mepro-21 while in the IDF (though I was mainly a sharpshooter/sniper, but we switch around there), I would like to make some comments about it:

    1)- The reticule used by the IDF is an orange dot, not sure of the MOA.

    2)- I will say two things about the Mepro-21’s durability to abuse (especially at the hands of IDF soldiers):
    —–1)- The top metal part surrounding the fiber optic gathering tube seems to break rather often, but it doesn’t affect the units functioning in any way; to the contrary, most soldiers like it better since the fiber gatherer now has access to more light. (You can see a great example of this in the second to last picture)

    ——2)- I have never encountered a Mepro-21 that didn’t work. I myself broke/had broken over three Trijicon ACOG’s but have never seen a broken Mepro-21 that didn’t put up a dot except for the lack of Tritium at night on some older sights. These things are built strong.

    3)- Standard IDF practice (which unfortunately is not always used) is to open up the back-up iron sights as well that co-sight with the Mepro-21, that way no matter what lighting conditions you will have a sight to look down (even though the Mepro-21 is faster); unfortunately the dot isn’t the brightest so this is good practice to do. The tube trick also works well enough at very close range.

    4)- It’s standard issue for nearly all combat soldiers, though some of the more experienced and officer/commanders get the MARS sight (usually for its laser for marking targets).

    • Thanks for the info.

      I have always wanted one of these scopes. Partly because the I love the green/amber coating 🙂

    • Great comments!

      You mentioned the broken sight in one of the photos, this was a known problem, and has been corrected by reenforcing that portion of the sight on the current model.

      The M21 is continually upgraded as newer technology is developed, so basically an M21 that you buy today is a different sight from one you bought three years ago.

      You also made a good point about using the sight itself as a large sort of aperture sight for close range shooting if the reticle became lost for some reason. This is especially important for battery-operated electronic sights that can fail during shooting for many reasons.

      The Mepro MOR now offers built-in visible and IR lasers for those who need lasers. It also has a battery powered illumination assist, allowing the reticle to be smaller.

  • El Duderino

    These are great sights. I have an M21 with the 12MOA amber triangle and it’s sighted in to hit right at the top of the triangle out to 100 yards or so.

    Can’t attest to the durability, but I read plenty reviews of the no batteries tritium/fiber optic reflex sights when I bought my M21, most said it was superior to the Trijicons and at the time cheaper. Now, a year later, I see some of the Trijicons in the $400 range.

    Like the article says it’s probably not the best for super bright conditions due to washout (which is strange since Israel gets plenty of bright sunlight) but for indoors or dawn/dusk conditions it’s fantastic.

    • El Duderino

      Forgot to mention, those $400 Trijicons don’t come with a mount, so they’re basically the same price as an M21 once you buy a decent mount.

      • Mike Knox

        Well, the M21’s a mount adjusted reflex sight, so you’ll just get a riser if you’d want or need to. I might say the same for the Trijicon, but that may be unnecessary or just inconvenient..

  • Sid

    Unless there is more I am missing, the IDF soldier in the top photo is using the leaf sights for the M203 and not the M21 rifle sight.

  • Lance

    I do think this is alot better in accuracy than the EO tech is. However HUD based sights never give long range accuracy Iron Sights and Scopes do. Past 200 yards they spray and miss more than hit. AIMPOINTs do much better than these. Personally the best AR type optic is still the Trijicon ACOG Scope in 4×32 with doctor sights this gives you every thing you need for a combat optic.

    Overall for Cops who do urban carbine training this is just fine though.

    PS I love the shots of the Israeli CAR-15s and M-4s with them on it.

    • Accuracy is accuracy. If the optic is accurate and the weapon is accurate, the system will be accurate at any range. No optic is accurate at one range and then somehow so inaccurate that you miss more than you hit. This myth came from the military designation CCO which was given the the M68 (Aimpoint) sight. Soldiers erroneously believed it stood for “close combat optic,” and a rumor was established that the reflex or red dot type sights somehow were only accurate out to 100, 150, or 200 meters, depending who is telling it.

      Now, there are systems out there that are designed for longer range shooting, with magnification and finer reticles. This allows the shooter to be more accurate at longer ranges by allowing him to more precisely place the shot and view the target. A non-magnified optic is has long-range limitations due to the lack of the shooter’s ability to see the target clearly enough to place the shot, and lacks reticles designed to precisely range targets. Adjustments tend to be designed for zeroing and not for adjusting for long-range shots. However, a weapon with a reflex sight like the Mepro M21 is just as accurate at 600 meters as it is at 60 meters, as long as the shooter is skilled enough to hold over and place the shot correctly. There is no range at which the M21 magically loses accuracy, and the tendency is for shooters to shoot more accurately with a reflex sight than with iron sights at any given range due to the advantages of the reflex optic in placing the reticle on the same focal plane as the target, and because of the precise reticles.

      For true long-range shooting, a rifle with a dedicated long-range optic is the best choice, but for combat or duty use, the M21 is much better than iron sights (or a magnified optic in the hands of those untrained in their use). We don’t believe in a magnified optic for standard use by the average soldier. Magnified optics are valuable for snipers and designated marksmen, however.

      • Lance

        I disagree ive seen many shoot and red dotes dont give good accuracy past 200 yards. Overs for CQB they do well but not for shooting in open area combat.

      • Joe Schmoe

        Hello MAKO,

        I would suggest refraining from responding to ‘Lance’. He is a well known “troll” on many defense related websites and spews nonsense in order to arouse emotional/angry but obvious responses.

        Just ignore him.

        That said, the point you are making is 100% correct and obvious once said.

      • Thanks, Joe. I won’t be trolled, but I did feel the need to respond to his statements for those who were reading and might assume he was correct.

      • W

        mako, you are absolutely correct. While it was designated as a Close Combat Optic, per united states army national stock number designation and item name, it is still as effective as the weapon system and the shooter behind it i.e. with a proper understanding of ballistics, the marskman can engage targets up to 500 meters with a M4 or longer. There is no “bracket” in which the CCO is only effective within.

        What makes the Aimpoint, and other high quality red dot sights, so special is that it is parallax free. Cheap red dot sights from walmart for example are not parallax free.

        Eotechs are precisely accurate, which explains why there is a magnification attachment and even a model of holo sight with a 500 meter reticle.

      • Yes, CCO actually stands for Collimating Combat Optic.

        No reflex-type optic is truly parallax-free – all will exhibit parallax at certain ranges – but military-grade sights are designed to exhibit parallax only at very close range where it does not matter. You can see this in some people’s youtube videos where they are looking at a wall three feet away with an EOTech and noticing parallax. So to be totally honest in our marketing, we advertise the Mepro M21 as having reduced parallax – like all other quality sights, there is no parallax at normal CQB ranges and beyond. Many cheap red dot sights exhibit parallax at the normal engagement ranges and this can hurt the shooter’s ability to shoot accurately at those ranges.

        The two big advantages of the Reflex sights, as you stated, is the lack of parallax at normal engagement ranges and beyond, and the positioning of the reticle on the same focal plane as the target so that the shooter can be focused on a target, raise the weapon to bring the reticle into his feild of view and into alignment with the target, and fire – all without changing his focus from the target. The combination of these two features on a sight with an aperture about 30mm – not much smaller or larger – gives a huge advantage in combat speed and accuracy over other sighting systems.

      • W

        mako, once again you are right and specifying the term “collimator” is basically a technical term for parallax free sight (or significantly reduced parallax, as you explained above), though, as i foolishly forgot to mention previously, the term “Close Combat Optic” is used because it is what reads on the army property book and what is referred to in the Army Armorer’s Course and SAMG, which interestingly says “Sight, Reflex, Collimator, M68 Close Combat Optic, which is redundant. in the case of any “good” optic, it is indeed “collimator” type. 😀

        Compliments to your products. Truly outstanding. After reading article, i might order one LOL

      • John

        How is the “X” reticle zeroed’ and sighted in? Ive heard people using the triangle tip for making precise hits out past 100 nd 200 but wondered if this can be done with the open X. And by the way I may by one from a friend to evaluate as a replacement for an eotech Ca can’t seem to get a zero on my Quadrail M-4 /fixed carry handle.

    • Jason

      Lance, I wholeheartedly agree with you saying the 4×32 ACOG is the best all around for the AR, but I had you a thumbs down anyway. It just seems like the thing to do.

  • Mike Knox

    Hold on, is this sight out already? because I happen to have what ammounts to $580 in £s.

    • It has been out for many, many years, and improved many times as new technology is developed. Contact Meprolight to find out who imports them to your country.

  • Volk CNC

    The M21 works, but not great. The first batch of civilian Tavors that came into Canada were all fitted with the M21. From what I understand, 90% of the owners of that first batch have an M21 in their parts bin collecting dust. The first thing we all did was ditch the optic. The dot isn’t very sharp, mine looks more like a smear. As well, the optic becomes useless if you are shooting from a dark position out at a bright target. From a shady, roof covered firing line at the range, for example. The light culminating dot becomes completely invisible.

    Someone else called it a budget optic, that’s a fair assessment. It works, is build strong, but it has enough short comings that I haven’t used it on any other firearms.

    In summary, do not buy it. For the ridiculous $500 price point, just get an Aimpoint or Eotech.

    • Alex-mac

      They can justify that price cause, there’s this mistaken belief that Israeli military equipment is high end operator stuff.

    • That is interesting. The entire IDF uses this sight, as do many militaries and law enforcement agencies around the world. In most serious optic competitions for military or LE contracts worldwide, there are four major players: Aimpoint, EOTech, Trijicon and Meprolight. Each wins some, but all make high-quality respected optics. Most of Meprolight’s foreign contracts for M21 sights are the result of being chosen by those countries over the other competing optics. If what you are saying were true, that 90% of Meprolight optics were unusable, then Meprolight would have no serious sales of this optic, especially not to the IDF.

      I have used and tested the M21 with multiple reticles. I have shot with it in many different light situations. Here in Alaska, I have tested it out of the windows of dark rooms onto sunlit snow. I have tested them in the desert. I have tried them indoors in many different levels of light. I have never had a situation in which I could not see the reticle, except when shining a surefire light against a gloss white painted wall from a few feet.

      Sure, from a dark room into sunlit snow the reticle is dim, but can still be picked out, and in that type of situation you will always be shooting slower, aimed shots, so this is not really an issue. If you found a situation where you really couldn’t find the reticle, then you can use your backup sights for any longer shots.

      Shooters seem to have a tendency to run their battery-powered optics at too bright a setting for the ambient light conditions. This is a very universal mistake. The result is that they thing that a sight that is designed to be no brighter than necessary (which is the way any reflex sight should be run) is not bright enough. It is an issue of training.

      I have never seen a reticle that was a smear or unclear. All reticles I have seen were sharp, bright, and clear. If a reticle begins to get dimmer, you can just run the sight under water to rinse any accumulated dust off, and the reticle will be right and clear again. We sell a lot of these sights in the US and have never had any complaints like yours.

      I have never spoken to anyone who used this sight in the military who disliked it. This sight has been in constant combat use since it was introduced. You can see Israeli soldiers with M21s that are totally silver and all edges battered until it looks like someone spent hours going over them with hammers, and they are still on their rifles and still being used.

      We understand that Aimpoint and EOTech fans are often somehow offended that this sight has come to the US market, but the quality of the M21 is at least as good as any other MIL-SPEC reflex sight in use today. We expect that some people will prefer other optics, but we also expect people to be fair toward Meprolight’s products and avoid spreading misinformation.

      • Volk CNC

        “Sure, from a dark room into sunlit snow the reticle is dim, but can still be picked out, and in that type of situation you will always be shooting slower, aimed shots, so this is not really an issue. If you found a situation where you really couldn’t find the reticle, then you can use your backup sights for any longer shots.”

        That’s the most ridiculous thing I’ve ever heard. I just tried mine again from an ambient lit room out into an overcast day, I had to search for the dot. If you can’t see the dot, you can’t aim. You should never have to search for your aiming dot. As a solution, instead of having an optic that works in all situations, you want me to transition to back-up sights? Then why do I even have the Mepro sight if I’m just going to use irons? That sounds like a pretty big short coming to me.

      • Maybe you need to clean your sight, if you even have one, I don’t know. If your reticle is not clear and sharply defined, it is probable that there is dirt blocking it. As I said before, I have shot with a lot of these sights in a lot of situations and have never had a situation in which I had trouble using the reticle. I have seen this issue in some of the older sights of this type that predated the M21, but not with current M21s.

      • Volk CNC

        The sight is not dirty, it has only seen 100 rounds on a rifle. I’ve had it for 5 years, 4.5 of those years it has spent sitting on a shelf.

        Since you doubt I even have one, it says on the side MEPRO21M REFLEX. Serial number: 0801A1443.

        The issue of reticule wash-out is not new and it is not just me. Every owner of the Mepro 21 I have talked to has the same problem. Many of these persons are professional shooters on the two way range whose opinions I value greatly.

        It is strong, reliable, well built site. However, it has short comings.

      • Today the sky is clear and the sun is shining brightly. I have five M21 sights handy to test, all used – a couple years old, none new. Some are clean, others still have varying amounts of carbon darkening the forward light collector window from being shot extensively by students in our training courses.

        I am testing these sights out a window against the snow and various objects at various ranges. Without artificial light in the room, with the muzzle of the carbine ten feet from the window, I can see the reticle easily against any non-snow target (trees, fence, light green house, light blue shed, pieces of lumber, etc.) On the planes of the snow that are not directly facing me, I can see the reticles. They are not bright, but I can see it. On the planes of the snow directly facing me (and the sun) I cannot see the reticles. This is maybe 15-25% of the surface of the snow from my perspective. This is not a problem for me though, because the snow has many planes and varied brightness, so as I move the reticle across the snow I can see it. I have no problem bringing the carbine up on a small target against the snow and putting the reticle on target quickly.

        If I move to the window, with the muzzle about one foot inside the window, The reticle is brighter and I can see it on all surfaces of the snow. On the planes directly facing me and the sun, the reticle is very dim against that background – definitely not a big contrast with the background. However, the reticle is still clearly defined and i could easily shoot with it. Again, any target that is out there other than snow shows a good contrast with the reticle. So if I needed to shoot out of this window, I could easily do so with this sight in these conditions, even if my target was white, from a few feet inside the window. If the target was really a reflective bright white like the snow, then I may have some trouble clearly picking out the reticle against the target, but that would not prevent me from accurately hitting the target, as I could see where I was centering the reticle, based on the targets background. Very few targets will be a bright, reflective white. I white t-shirt is not reflective enough to keep me from finding the reticle.

        The Bullseye reticle is most resistant to washing out and the easiest to find against the snow, followed by the triangle and open X, and finally the two dot reticles.

        If your sight washes out from a lit room looking out a window on an overcast day, then there is a problem with that sight and you need to contact your Meprolight representative in Canada.

        If you say that everyone that you know has the same problems, that 90 percent of owners in Canada had sights that are unusable, that all of your friends who have used them in combat same problems, that to me is all unfounded. I hear arguments like these often from people who don’t like a particular product (ours or someone else’s) and back it up with “all the high-speed operators I know” argument. I am interested in your experiences, not vague statements that all these guys you know who used it in combat had problems with it, especially since the guys I know who have used it in combat liked it. I used different optics in combat, but had I had the M21 I would have preferred it.

        I have used many reflex sights – Aimpoints a lot, EOTechs not quite as much, tried the older Meprolights and Trijicons, used the Mepro MOR and M5, and as a shooter, my favorite sight is the M21. I use it and trust it. I just got a .50 Beowulf to use for bear defense, and there is an M21 on top.

    • FyreMedic

      Hey Volk, feel free to have any of those in the “parts bin” sold to me, since they are obviously no good, I will give you $100 ea.

  • For those that can’t see the dot clearly, it’s your eye sight. You need glasses.

    FYI, Mr. Mako is a retired National Guard Sr NCO. He had shot plenty of bad guys with all kind of optics mounted on many weapons when deployed in the sand box. I will take his words above any recreational shooter.

  • Mark

    I am really interested in this site. Does anybody know if and where it is available in Canada? I have been looking online for a couple of weeks and can only find it in the US. They will not ship it across the border.

  • Colton

    Is it wise or even worth while to have both a Meprolight M21 and say a green/red laser sight on the same rifle?

    • Sure, if you need a laser. I years ago I was against lasers on weapons, until I used them in combat, now I think they can be very useful.
      In that case, just get a Mepro MOR – it is all together – lasers built into the reflex sight and all three zero simultaneously with one adjustment.

      • Colton

        Thank you for the quick response Mr. Mako. I already have in my possession the Meprolight M21 bullseye reflex. Looking for other attachments that I may need for CQB instances.

      • There are several quality laser manufacturers. Green lasers are all the rage right now, but actual use has shown that red lasers are as effective and less expensive. I can’t really endorse a particular company, but do a little research and get past the hype and you should be able to get a quality laser. Just remember that a night vision video of soldiers with PEQ-2s on a company’s website does not mean the special forces use their lasers.

      • Colton

        Thanks again for your valuable input Mr. Mako. I was looking at a 5mW Green/Red Laser Sight by Barska for my Bushmaster XM15. From one veteran to another, thanks again.
        Sgt., USMC 2003-2007

  • Alan

    So, will this fit an M4 rail with a magpul mbus rear?

    • Of course, it is what it is designed for. It will work perfectly that way.

  • Jim McCain

    I have a Mepro 21 sight and find it excellent. Sure it is a bit dim when aiming from a low light to bright light situation but it is still easy to pick up and im using the smallest dot. The bullseye and X reticle are even easier to pick up and in all other situations they are all awesome. I like the sturdy construction and the ease of sighting in and the light weight. I also like the fact that there is no battery. The company will replace the tritium when necessary. Volk CNC just doesnt like the sight and cites hearsay for proof. I highly recommend the sight and its easy to make shots out to 200 yards with it and its fast close up and at night.

  • This site definitely has all of the information and facts I wanted concerning this subject and didn’t know who to ask.

  • Is the Mepro 21i reflex sight the most recent up grade of this model? It does come with QR levers to install & remove?

    • Timothy Yan

      No, you can’t remove the QD mount. QD mount is factory calibrated to the optic.

  • How long is the Meprolight M-21M on the the market & does The Mako Group sell the M-21M model presently?

    • Timothy Yan

      All the current production are the -m version. The design have been around for almost 30 years.

  • what about m21 for smith & wesson 460xvr revolver??? concerned about eye relief. thanks

    • There is no issue with eye relief, but I would be concerned about the size and weight on a pistol. The size is ideal for a carbine or rifle, but a pistol, even a heavy revolver like yours, may be better with a micro sight like the Trijicon RMR.

  • The weight of the 460 xvr is 82.5 oz. The barrel length is 10.5″ its like a small carbine already the additional 8-10 oz. is no problem. However the new concern is the blast from the cylinder of the revolver hope i’m not about to cook a M21. Any help or thoughts.

  • Astounding article, cheers, I will register for your RSS now. E-mail me if you want.

  • Liam NEWM21

    Dear Mako,
    Maybe you can help me. I just bought an M21 w/bullseye reticle at a gunshow here in orlando and first off I friggin love this thing. But I took my sigm400 to my local gunsmith to get some help with the magnifier. I got the usk3 shooter kit w/ trippler and mam30 mount and my gunsmith tells me that this trippler was not meant to be used with this sight. Evidently you cant mount the sight and trippler close enough together to make the eye relief manageable. Did I get the wrong tripler or did the dealer swap the trippler with another? Also I was getting a fair amount of washout dry zeroing the rifle in my house…Im thinking this is somewhat normal based on the posts youve submitted. My reticle almost looks as if breaking up in places. like its missing little cracks and this washout? thanks for any help and I cant wait to get out and shoot with this thing. take care

    • Timothy G. Yan

      Just checked. It works fine with my Burris and Mepro X3 magnifier. If you planning to use the M21 with magnifier, I suggest the X reticle.

  • John

    Just a few words regarding Mepro support it is non-existent
    and the factory will not even answer an email or fax unless they want to

    Purchased sight new and after 18m the sight went very dim /
    useless so tried to go back to dealer to find no longer trading

    Mepro did not want to know but offered a few stickers!!

    Only after contacting various agencies did I get reply and
    after much discussion did they agree to repair but had to wait for them to get
    authorisation for me to send sight back?

    Waited 4m then send back as now answer to emails or posts on
    face book only for the parcel to be refused to be singed for so returned un-
    repaired or opened

    Would not advise any contact at all go to some other company
    that looks after their customers

    And provides equipment that works your life may need it on
    it one day??

    • Timothy G. Yan

      You have to deal with the Mepro distributor in your country for service. If you are in the USA, you have to contact Mako Group for customer service.

  • MotorCity MadMan

    I have been looking at this fine optic for quite some time….. I just recently discovered the M21 is the optic of choice for the IDF and that helped to seal the deal for me.

    Pay no attention to the few posers spewing their usual garbage regarding this
    fine optic!

    I agree with your assessment about these clowns……not only do they most likely NOT own an M21 optic…….but I might even go as far as to offer up the fact they do NOT even own a fighting carbine!……ha-ha…. 🙂

    I am used to being the brunt of internet trashing-n-bashing due to the fact I choose to use my customized Maadi AK47 as my fighting carbine of choice and continually
    bear the good fortune of laughing at these punks at the range on a regular basis watching them try and figure out how to run their “black rifle” with all the rails and fancy add-ons and gadgets hanging off every side of the fore-end…..

    Anyway……back to my original point……after reading several positive reviews both online AND in print….I have decided to finally pull-the-trigger and order MY M21!

    The only decision I need to make now is……which Reticle to go with….

    THANKS for a very informative thread and I look forward to posting updates and photos!

    • Timothy G. Yan

      As for the reticle, I like the big triangle. You can use the tip for precision.

  • Best Handgun

    Have you ever thought about writing an article on the Wounded Warrior Project. Im all about guns and stuff but please write about it.

    Just a thought

    • Timothy G. Yan

      Are you sure the WWP like anything firearms related?

  • Mako

    Mako lied again. Kimber is authorized to distribute Meprolight Sights in the USA too.

    Why does Mako always say that they are the only? Why must they rename all of the gear they sell and pretend that they made it?

    I’ll never buy from the Mako liars!

    I always buy from anyone else!