As the victims of the shooting likely do not know the law and are likely blameless, I hope they are not putting any money of their own into this suit...
https://www.law.cornell.edu/uscode/text/15/chapter-105 [h=1]15 U.S. Code Chapter 105 - PROTECTION OF LAWFUL COMMERCE IN ARMS[/h] [h=1]15 U.S. Code § 7901 - Findings; purposes[/h] (5)
Businesses in the United States that are engaged in interstate and foreign commerce through the lawful design, manufacture, marketing, distribution, importation, or sale to the public of firearms or ammunition products that have been shipped or transported in interstate or foreign commerce are not, and should not, be liable for the harm caused by those who criminally or unlawfully misuse firearm products or ammunition products that function as designed and intended.
[h=1]15 U.S. Code § 7903 - Definitions[/h]
(1)Engaged in the business
The term “engaged in the business” has the meaning given that term in
section 921(a)(21) of title 18, and, as applied to a seller of ammunition, means a person who devotes time, attention, and labor to the sale of ammunition as a regular course of trade or business with the principal objective of livelihood and profit through the sale or distribution of ammunition.
(2)Manufacturer
The term “manufacturer” means, with respect to a
qualified product, a person who is engaged in the business of manufacturing the product in interstate or foreign commerce and who is licensed to engage in business as such a manufacturer under
chapter 44 of title 18.
(3)Person
The term “person” means any individual, corporation, company, association, firm, partnership, society, joint stock company, or any other entity, including any governmental entity.
(4)Qualified product
The term “qualified product” means a firearm (as defined in subparagraph (A) or (B) of
section 921(a)(3) of title 18), including any antique firearm (as defined in section 921(a)(16) of such title), or ammunition (as defined in section 921(a)(17)(A) of such title),
or a component part of a firearm or ammunition, that has been shipped or transported in interstate or foreign commerce.