Mass shootings make the news every time they happen. When the Pennsylvania news reports come out, it starts up the continuous argument about gun control and gun rights. Along with this comes people who call for gun manufacturers to be held liable for their part in the deaths from the shooting. However, you will not see many cases against gun manufacturers. There is a very good reason for this.
Time explains that there is a federal law the provides protection for gun makers and makes it so people cannot sue them for deaths resulting from the use of their products. This law also protects the companies making ammunition, and to some extent, it protects sellers as well.
There is a movement to repeal the law, but it has not had much success thus far in the years that backers have been trying to get it passed. It has never had a vote on it yet because it cannot get past committees and sub-committees.
This protection for gun manufacturers, though, leads to lawsuits against other parties. Most often, these end up being dismissed. They end without making much of a point or a difference. However, sometimes these lawsuits have merit, so it is worth at least looking into options if you find yourself in such a situation.
You cannot sue gun makers, but you can try to hold those responsible who failed to stop the gunman. Sometimes that can make a difference. This information is for education and is not legal advice.