Which BUS for "Precision" Build?

I'm building an 18" mid-length 6.5 Grendel right now that will be geared specifically for "precision" distance work. I'm a bit torn on which BUS to use on it, though. I put BUS on all of my ARs, but this one will be used pretty much exclusively with a scope. Since my scope will be mounted in a QD mount I feel like I should put some flip-ups on it. You know, just in case.

So... I'm looking for something light-weight and low-profile. I don't want to spend a ton of money because they will likely only ever be used during intial sight-in. I would just feel naked without something on there.

Suggestions?

kac 600 m.

like this one http://www.ar15.com/forums/t_7_163/995952_WTS__KAC_Micro_200_600_BUIS.html

+1 on the KAC 600.... small aperture, adjustable elevation, very low profile

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