For the purposes of this article:
"Firearm" means any weapon which will, is designed to, or may readily be converted to expel a projectile by the action of an explosive, as defined in 18 U.S.C. § 921(a)(3);
"Manufacturer" means any person engaged in the business of manufacturing firearms or ammunition for sale or distribution;
"Negligent marketing" means any advertising, promotion, or marketing practice by a manufacturer or seller that directly poses a foreseeable and substantial risk of harm to the purchaser or specific identifiable individuals;
“PLCAA” means the Protection of Lawful Commerce in Arms Act of 2005, 15 U.S.C. 105, et seq.; and
"Seller" means any person engaged in the business of selling firearms or ammunition at wholesale or retail.