Saying that it's over and the Reddit won is a bit naive. The majority of the subs that I used to frequent have come back online, but they are definitely still protesting. ProgrammerHumor is making new troll rules based on majority vote every week. Madlads made everyone a mod. Many subs are posting John Oliver or troll versions of their original purpose.
It's not over. Will they succeed? Who knows. But Reddit is currently a completely different place than it was a month ago because of the ongoing protests.
Magazine size laws aren't really effective at doing anything. Up in Canada you can't have a rifle magazine with more than 5 rounds. However, almost all of the magazines are full size magazines that have been modified to hold fewer rounds. All of the responsible owners leave them at 5, but with a minute or two of work you could turn most of them into full size again. We don't have mass shootings every day.
Gun violence in America is a culture issue. You're broken.