Benelli m4 optic mount?

I have the Scalar works sync with my RmR and its the best I have ever had or used... it looks feels bad ass. If I was a selfish man I want to be buried with my ben m4... but I WILL, pass it on to my son!
 
Is true, the factory rail is not to Picatinny spec and can cause issues with certain mounts.
 
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