I have the M&P 15 MOE magpul edition rifle. I'm trying to figure out if anyone knows if the Vortex SPARC 2 and VMX 3x optic will fit on the upper receiver top rail and still be able to keep the MBUS flip up rear sight for co-witness. Thinking it'll be tight if so. Anyone have any first hand, or expert information for me?

From the pics on the net, it looks like it would fit but is tight...

Let me know how it goes op.... I have a Vortex Strikefire and planned on purchasing the VMX 3x.... I wasn't sure if I would need to remove my MBUS or not

Mine didn't fit.

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Anyone interested in the Vortex Strikefire II, you can find it for 129.99 at midwayusa right now. Free shipping too.

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Rod
M&P 22A, 40c, 15A, 15-22

Looks like you have a different red dot... but yours could be kept on the receiver with a cantilever mount.

i just put this combo on my sport this weekend. I could not use the rear MBUS. The VMX 3X needs to be mounted as far back on the receiver as possible for eye relief. for me, even mounted on the very last rail slot, you still have to strain a bit to push your face far forward enough to get a full field of view through the VMX magnifier. So even if you could do it, I think you're better off leaving the MBUS out, or if you really want backups use a set of 45 degree offsets.

Vortex has the right idea. On their web sight they use a cantilever mount.

I think a lot of guys buy magnifiers for a red dot but they end up in the parts box. Adds a bunch of weight (three quarters of a pound for the Vortex 3x) and doesn't compliment the purpose for a red dot which is unlimited eye relief, field of view and fast target acquisition.