Does Magpul MBUS Co-witnessing with Eotech?


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EdLaver
February 3, 2011, 12:59 PM
For High Roaders that use this set-up or have tried it. Does your MBUS sights co-witness well with Eotechs? If so, what model Eotech?

Thanks,
Ed

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LiquidTension
February 3, 2011, 01:58 PM
Yes, they cowitness. I'm running one of the older AA models.

DoubleTapDrew
February 3, 2011, 08:29 PM
^ same for me.

benEzra
February 3, 2011, 11:47 PM
Yes. The MBUS is the same height as all other AR sights.

How they cowitness will depend on the model of Eotech (this is true of all AR iron sights). Eotechs come in two basic flavors: (1) those that are set up for a lower-1/3 cowitness right out of the box, and (2) those that are set up for an absolute cowitness out of the box and need an aftermarket 7mm riser to do a lower-1/3. Within each of those two categories, some models have the capability to go ultra-dim for use with night vision equipment, and some don't (with NV capability jacking up the price quite a bit).

The following models are set up for a lower-1/3 cowitness out of the box, thanks to a built-in 7mm riser: Eotech 516, 517, 553, 556, 557. As far as I know, all other models (including 512, XPS series, etc.) are set up for absolute cowitness, so if you want a lower 1/3 cowitness you'll need a 7mm riser, like a LaRue QD mount.

Battery requirements are as follows:


516: two CR123, 1000hr runtime at brightness 12 (longer at lower settings)
517: two AA, 600hr runtime at brightness 12 with alkaline, 1000hr with lithium
553 (similar to 516 but with NV setting and QD base): two CR123, 1100 hours runtime at brightness 12
556 (similar to 516 but with NV setting): two CR123, 1100 hours runtime at brightness 12
557 (similar to 517 but with NV setting and multi-dot reticle): two AA, 600hr runtime at brightness 12 with alkaline, 1000hr with lithium


I prefer CR123 because they are physically shorter and allow me to run the same battery type in my optic and light. They don't cost any more than AA lithiums and are available at my local Walmart just like AA, so I don't really see much logistics advantage in using AA's.

The XPS series all run off a single CR123 battery and are set up for absolute cowitness (they need a 7mm riser to do a lower 1/3). The designations are as follows:


XPS2-0 single dot in circle (traditional Eotech reticle), no NV setting
XPS2-1 single dot only (no circle), no NV setting
XPS2-2 two dots in circle, no NV setting
XPS3-0 single dot in circle (traditional Eotech reticle), NV setting
XPS3-1 single dot only (no circle), NV setting
XPS3-2 two dots in circle, NV setting


More here:

http://www.thehighroad.org/showpost.php?p=6637932&postcount=9

Here's an Eotech 516 with a rear MBUS:

http://www.commongroundcommonsense.org/forums/uploads/1188452912/med_gallery_260_23_87682.jpg

http://www.commongroundcommonsense.org/forums/uploads/1188452912/med_gallery_260_23_3167.jpg

MrCleanOK
February 3, 2011, 11:56 PM
They will cowitness if mounted directly to the receiver.

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