A rule regulating the firearm kits was a centerpiece of President Joseph R. Biden Jr.’s gun control initiative. The Supreme Court has upheld the regulation, issued in 2022.

This article was update on March 26 at 2:04 p.m. The Supreme Court on Wednesday upheld a Biden-era rule regulating so-called “ghost guns” – untraceable weapons without serial numbers, assembled from components or kits that can be bought online.

The Supreme Court ruling affects ghost guns, the largely untraceable firearms used in a growing number of crimes over the past decade.