Mandatory Gun Show Background Check Act

[AI summary unavailable — showing source text] Mandatory Gun Show Background Check Act - Amends the Federal criminal code to set forth provisions regarding the regulation of firearms transfers at gun shows. Defines "gun show" as an event sponsored to foster the collecting, competitive use, sporting use, or any other legal use of firearms, at which: (1) 50 or more firearms are offered or exhibited for sale, transfer, or exchange, if one or more has been transported in, or otherwise affects, interstate or foreign commerce; and (2) there are not less than ten firearm vendors. Requires a person who is not a licensed importer, manufacturer, or dealer, and who desires to be registered as an instant check registrant, to submit to the Secretary of the Treasury an application which contains: (1) a certification by the applicant of compliance with specified Federal firearms license requirements; and (2) the applicant's photograph and fingerprints. Requires the Secretary to: (1) approve an application which meets such requirements; (2) issue to the applicant (on approval of the application and payment of a $100 fee for three years, and upon renewal of valid registration a fee of $50 for three years) an instant check registration; and (3) …