Stop Illegal Trafficking in Firearms Act of 2013

[AI summary unavailable — showing source text] Stop Illegal Trafficking in Firearms Act of 2013 - Amends the federal criminal code to prohibit any person (other than a licensed importer, manufacturer, or dealer) from knowingly purchasing a firearm for, on behalf of, or with intent to transfer it to, any other person, or attempting or conspiring to do so, if that firearm has moved in or otherwise affected interstate or foreign commerce. Includes the receipt of a firearm from pawn or on consignment as a "purchase." Sets forth exceptions for certain bona fide gifts and for certain bona fide winners of an organized raffle, contest, or auction. Prescribes fines and subjects property derived from or used to commit such offense to forfeiture. Applies an enhanced penalty for any such violation committed knowing or with reasonable cause to believe that a firearm involved will be used to commit a crime of violence. Directs the U.S. Sentencing Commission to review and amend its guidelines and policy statements to ensure that persons convicted of offenses applicable to straw purchases of firearms are subject to increased penalties. Includes such a firearms trafficking offense within the definition of: (1) "racketeering activity," and (2) "…