Interfearance between the charging handle and the scope is a fact of life for AR owners. The best thing you can do is have a scope with good eye relief and as short a stock as possible. It may feel a bit wierd with a short stock but it's only your trigger hand position that changes and a short stock leads to a short overall rifle.
I have a Leupold 3x9 on mine which has fairly good eye relief and the end of the scope is just foward of the charging handle. I have the areo precision mount but not the cantaliever one. so I had to make up a recoil pad to extend the length of pull a little. My stock is the AIL A cat non adjustable one so the stock is as long as the rifle length buffer tube.
As AzumitH mentioned a dirty great tacticool charging handle will fix the problem as well. This has the pro that your rifle now looks more tacticool like the one on counterstrike and the con that the thing rubs against you when carring your rifle on a sling and catches on your clothing.
Long story short I would get a cantaliever mount and as short a stock as possible.
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