"The Protection of Lawful Commerce in Arms Act (PLCAA) is a United States law which protects firearms manufacturers and dealers from being held liable when crimes have been committed with their products. However, both manufacturers and dealers can still be held liable for damages resulting from defective products, breach of contract, criminal misconduct, and other actions for which they are directly responsible in much the same manner that any U.S. based manufacturer of consumer products are held responsible. They may also be held liable for negligence when they have reason to know a gun is intended for use in a crime.
The PLCAA is codified at 15 U.S.C. §§ 7901-7903."
A NYT editorial urges that this so-called "Gun industry shield law" be repealed and that gun manufacturers, wholesalers, and retailers should face liability is someone commits a crime with a weapon they manufactured, etc. This is a back-door move to try to put American gun manufacturers out of business. The issue arises regarding the Bushmaster semi-automatic rifle (AR-15 copy) used in the Sandy Hook School mass murders
As the quote indicates, the Act is not a complete shield. I believe it is a fair way to deal with the issue. The statute does not authorize liability in the Sandy Hook case. It should not be repealed. Note that Clinton and Sanders are urging repeal.