The Gun Feed fell for it. They linked to a “Real News, Right Now” piece called Obama, Key Democrats to Introduce Legislation Banning 30 Round Magazines in Video Games.
For those interested, there really was an HR 4783, Promoting Healthy Minds for Safer Communities Act of 2014. In the 113th Congress (the 114th is currently sitting). It was introduced 5/30/14, referred to the Subcommittee on Crime, Terrorism, Homeland Security, and Investigations in July last year, where it died.
All else is satirical BS. When in doubt (did so few notice where this appeared?), do a web search.