Gun Control & RKBA

That is the key, here, I believe. Ever heard of anyone getting a verbal warning for a speeding ticket, and someone else getting the max fine? One person getting arrested for public intoxication, and a different person getting a ride home? There has always been selective enforcement, at all levels of government. Sheriffs are elected by the local population, and many personally know them. Counties have different living situations, some, inner city, some very, very rural. The sheriff is most likely to ignore federal/state laws that the "locals" don't see as being a productive deterrent, or a politically "hot potato". The magazine/gun ban laws, for example, are being "ignored" by mostly rural sheriffs, whose county populations shoot, hunt, etc. with firearms, alongside the deputies of the local police force.