Trijicon RMR vs Mepro M21

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Astute Observer

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Hey all - curious to get your thoughts on fibre-optic and tritium optics options. I'm looking for a non-magnified option that will never need batteries, and came up with these two: The Trijicon RMR Dual Illuminated, and the Meprolight M21.

For both cases, they're close in price (though the Trijicon would require a picatinny rail adaptor). Application would be to get two, one to put on a scout mount for a bolt action scout rifle, and one for a shotgun. I like the option for a simple triangle reticle - advantage goes to the Trijicon as they have green as an option not just amber like the Mepro, but the size of the Mepro looks like it offers a better field of view... Though the Trijicon looks like it would be lighter.

Any of you have experience with either of them? Any thoughts on the advantages or disadvantages of each?

Thanks for any input!

The Trijicon RMR Dual Illuminated:

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The Meprolight M21:

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M21 has bigger objective and it already comes with QD mount. M21 has 5 reticle options but they're all available in one colour only. M21 also includes an ARD and scopecoat.

RMR is more compact and you have to add cost of a mount. ARD and scopecoat is also extra.

Pat Mcnamara runs the RMR as his primary optic on his AR.

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Make sure you know about washout before buying either... If you're in the shade (like shooting from under a covered firing line) you WILL NOT be able to see your reticle if your target is in sunlight. This is true of both my M21 and the RMRs I have handled. Ended up buying a LED RMR for my pistol as a result.

The M21 does have a larger FOV, though that doesn't apply if you use BAC.

You can SOMETIMES find add-on WORs for the M21 at Zahal, but they are rarely in stock.
 
Phat Eagle said:
Make sure you know about washout before buying either... If you're in the shade (like shooting from under a covered firing line) you WILL NOT be able to see your reticle if your target is in sunlight. This is true of both my M21 and the RMRs I have handled. Ended up buying a LED RMR for my pistol as a result.

The M21 does have a larger FOV, though that doesn't apply if you use BAC.

You can SOMETIMES find add-on WORs for the M21 at Zahal, but they are rarely in stock.
Click to expand...

Thanks for the advice about wash-out, I didn't realize that. I guess the tritium isn't strong enough on its own, you need the ambient light coming in as well then...?

Yeah, I do plan to use BAC so the FOV might not be that big an issue.

Also, forgive my ignorance - What are WORs?
 
mebiuspower said:
M21 has bigger objective and it already comes with QD mount. M21 has 5 reticle options but they're all available in one colour only. M21 also includes an ARD and scopecoat.

RMR is more compact and you have to add cost of a mount. ARD and scopecoat is also extra.
Click to expand...

that ARD for the RMR is pretty cool looking I have to admit. Like the compactness of it too.
 
Interesting - also found the Holosun series. Solar powered LED with a battery backup. Might be the best of both worlds... What's Holosun's reputation? I hadn't heard of them before...

This one's particularly interesting, though it doesn't come with a triangle / chevron reticle...

The Holosun 510C

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I'd say the Trijicon "RX" (reflex) series would be more comparable to the M21 for size/weight. I believe the M21 is about 8 ounces, while the RMR is just over 1 ounce. The RMR is truly tiny by comparison. I don't own the M21, but I do use an RM05G on a Scalarworks mount to absolute cowitness on my Benelli M4, and an RM08G that will eventually permanently be on my Vector, once I upgrade the mount. Trijicon seems to be moving more towards LED as washout will always be the Achilles heel of dual-illuminated models.

The amber reticle doesn't work for me either, which is why I went for only green. That would disqualify the M21 for me, though I do like a couple of their reticles. The 9MOA dot of the RM05 limits my shotguns intended purpose to rather...short range. ;) Worst case scenario, if you will.

While I prefer non-powered optics, I do make an exception for the very proven Aimpoint micro. I carry an extra battery, but I know I'll never need it. With the price of RMR's + mounts now, the Aimpoint is worth adding to your list IMO. I prefer it to the RMR as a stand alone sight, but the miniature RMR is tough to be as an ancillary to irons.
 
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