Well, as an FFL Licensee I do my due diligence prior to selling a firearm or ammunition. Here are the laws/regulations that apply:
http://www.atf.gov/publications/download/p/atf-p-5300-18.pdf
http://www.atf.gov/publications/newsletters/ffl/ffl-newsletter-2008-11.pdf
Now, you can make an informed decision on who you would sell to, if you were invested in a multi-million dollar operation that sells firearms and ammunition. Mine is not a multi-million dollar operation, but Dick’s is).
Then why is Dick’s the only one doing this?