According to city officials, the lawsuit alleged that companies Polymer 80 and JSD Supply perpetuated ... the Kensington shooting where the individual had an AR-15, was a ghost gun.

D.C. has won a permanent injunction, and a $4 million judgment, against one of the largest manufacturers of unserialized ‘ghost gun’ parts, after a judge ruled that the company falsely ...

Manufacturers such as Polymer80 sell “gun assembly kits,” which often come with the lower 80 percent of the gun ... firearms when used as part of an AR-15 rifle. The other 20 percent ...

which include an AR-15 semi-automatic rifle, a .308 semi-automatic rifle, and at least seven types of handguns, are no more than 80% complete. Consumers can purchase the lower receivers of rifles ...