The Supreme Court on Tuesday signaled a willingness to uphold a Biden administration regulation on “ghost guns,” mail-order kits that allow people to build untraceable weapons at home and that are turning up at crime scenes with greater frequency.

During arguments Tuesday, the justices suggested they will uphold regulation that prohibits the sale of the kits as a reasonable interpretation of the 1968 law that restricts the sale of firearms.

A Supreme Court argument about the government’s ability to ban so-called ghost guns took some unusual turns Tuesday as the justices mused about grocery orders, western omelets and the challenges of assembling IKEA furniture.