whats this repair

Repair? Are you referring to the area where the remains of the charger bridge was blended into the receiver?
 
It does look like a patch, doesn't it? The left side of the charger bridge is rivetted into a notch on the receiver. If you want a streamlined sporter, blending it is about the only way to go. Remove the bridge completely, and there is a very noticable notch.
 
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