The Las Vegas mass shooting has reopened the debate on gun laws, with a focus on modifications to semi-automatic weapons like the ones purchased by the Law Vegas shooter, who killed at least 59 people Sunday. » Subscribe to NBC News: nbcnews.to/SubscribeToNBC » Watch more NBC video: bit.ly/MoreNBCNews NBC News is a leading source of global news and information. Here you will find clips from NBC Nightly News, Meet The Press, and original digital videos. Subscribe to our channel for news stories, technology, politics, health, entertainment, science, business, and exclusive NBC investigations. Connect with NBC News Online! Visit NBCNews.Com: nbcnews.to/ReadNBC Find NBC News on Facebook: nbcnews.to/LikeNBC Follow NBC News on Twitter: nbcnews.to/FollowNBC Follow NBC News on Google+: nbcnews.to/PlusNBC Follow NBC News on Instagram: nbcnews.to/InstaNBC Follow NBC News on Pinterest: nbcnews.to/PinNBC Las Vegas Shooting Reignites Gun Debate | NBC Nightly News