AR10 Mag release too short

What’s to short are you threading the button into the release enough, you usually need to take a pin and push on the screw to thread the release into the button further
 
Either get an Aero M5 button and use a standard mag catch (L)
or
a standard button and a catch with an extended stud (R).

The standard catch stud will not be flush with the Aero button.

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