You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract NRA to Break Silence as Corporate Response to Connecticut Massacre Deepens NBC Sports Group Pulls Gun Ads; Dick's Halts Some Gun Sales By E.J. Schultz, Published on December 18, 2012 4 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.