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Sorry I never replied to your question...
The standard AR-15 DIAS will not work with the AR-10 because the rear lug on the AR-10 upper receiver is too large to allow the DIAS to fit around.
Now, I have posted elsewhere that I believe that if a person was to weld up the rear takedown pin holes on an AR-10 upper and lower receiver and then mill the takedown pin to AR-15 sizes and if you are careful to ensure that yur spacing is correct that the DIAS for the AR-15 could drive the AR-10 as well.
Given the $10,000 or more price of a rDIAS the cost to do these modifications to an AR-10 are not all that expensive to have done!
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