Scope and Iron Sight Mounting Convention

[mml373]

I have a Windham SRC-308 which I was shooting with "iron sights" (Magpul MBUS front/rear).  I decided to purchase a TA01NSN ACOG for this rifle and was wondering where this optic would mount in relation to the rear MBUS.  You can't use the MBUS while the ACOG is mounted.  The MBUS sights are robust and sighted in, so my intent is to keep the MBUS sights mounted as backup in case the ACOG bites the dust during an emergent situation such as the zombie apocalypse.  If I understand the ACOG design/intent correctly, it is intended for a "nose to charging handle" position...in which case I'd mount it toward the rear/behind the MBUS.

Just wondering what others are doing.  Thanks for any helpful replies.

[Rsquared]

Here's how I run mine on one of my AR-10 carbines.