The pro-guns in San Diego did mobilize their efforts.
I know there were at least 2 meetings among the tea party members organized to discuss how to protect the second amendment. They were on meetup san diego (Ramona). They were serious.
There was no meet-up gathering for gun control that I know of.
That tells you how unorganized the majority of the people who want some gun safety laws are. Until they fall the victim of guns, which is not that difficult when you think about it, they probably be way less fanatic and organized than the NRA and tea party crowd.