President Biden, in his first gun control measures since taking office, announced a half-dozen executive actions today aimed at addressing a proliferation of gun violence across the nation that he called an “epidemic and an international embarrassment.”  But today's announcement actually underscores the limitations of Biden’s executive power to act on guns. They include moves to tighten regulations on homemade guns and provide more resources for gun-violence prevention, but fall far short of the sweeping gun-control agenda he laid out on the campaign trail.