Congressman Pallone's bill, the '3D Firearms Prohibition Act', seeks to:

"...prohibit the sale, acquisition, distribution in commerce, or import into the United States of certain firearm receiver castings or blanks, assault weapon parts kits, and machinegun parts kits and the marketing or advertising of such castings or blanks and kits on any medium of electronic communications, to require homemade firearms to have serial numbers, and for other purposes. "