What is the fine-grained topic of the following text: Likewise, SAF founder Alan Gottlieb, acting as a private citizen, and the NRA have filed separate challenges to initiative 1639, the latest gun control proposal that strips young adults of their right to own a modern sporting rifle, and mandates waiting periods, registration and safe storage, while classifying popular .22-caliber rifles as “assault rifles,” critics assert. Only return the topic.
Challenges to initiative 1639 gun control proposal