I currently have a SBR BM with a 11.5 inch barrel with a fixed front sight and a folding rear, Eotech between the two.  The arrangement is ok, but I also have a ACOG on another rifle that I'd like to try on the SBR.  It seems the older I get, the more magnification I need.

Would you mount the ACOG on the SBR and look through the front sight base, or saw it off?  I picture this done and then made neat with a Dremel and file.  Or in the tradition of ARFCOM, get both and order another SBR upper?  Getting another upper means not only the expense, but I'd have to send the thing to Gemtech to get the mount for a suppressor, too, so this is an expensive route.

Or, just put the ACOG on the upper and not worry about the front sight base?

Or, just shut up and count my blessings and use the Ectech?

The AR15 is such a versatile platform - the possibilities drive me crazy.

If it's a 4x32 ACOG you'll see a blur on the bottom, with lower magnification like 1.5 it'd be more prominent, but since you've been using the EOTech where the FSB always shows up clearly, the blur on the bottom most likely won't bother you.
If it does, you can swap out the standard FSB with a folding front sight like PRI's and YHM's.  If you have railed handguards, then you can use KAC, Troy, YHM, etc.  So you have to send it back to Gemtech to install the flash suppressor?  Well then swapping out the front sight requires the removal of the flash suppressor.  I say live with the FSB blur on the bottom of the ACOG

I'd mount the ACOG and not worry about the FSB...you will learn to ignore the shadow in the bottom of the sight picture.

Or, just put the ACOG on the upper and not worry about the front sight base?

Quoted: I'd mount the ACOG and not worry about the FSB...you will learn to ignore the shadow in the bottom of the sight picture.

+1

Quoted: Quoted: I'd mount the ACOG and not worry about the FSB...you will learn to ignore the shadow in the bottom of the sight picture. +1

+2...if you're used to the EOTech, this shouldn't be a problem at all.  Shit, if you don't like it, just put the EOTech back on.