Question About Building AR-15.?

I am currently building an m4 profile AR-15, I have a couple questions, can I use a Magpul MBUS rear sight as a main sight, I know its a back up but i dont plan on using optics, will I lose accuracy because of this. I currently have a detachable carry handle sight but I would rather have a regular rear sight. Also... show more I am currently building an m4 profile AR-15, I have a couple questions, can I use a Magpul MBUS rear sight as a main sight, I know its a back up but i dont plan on using optics, will I lose accuracy because of this. I currently have a detachable carry handle sight but I would rather have a regular rear sight. Also how is the Magpul MOE grip?
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