A Texas company is set to release blueprints for making a plastic gun with a 3-D printer — a development Sen. Chuck Schumer called “stomach-churning” Sunday. Defense Distributed, a collective of gun access advocates headed by self-described “free-market anarchist” Cody Wilson, has announced it made such an untraceable gun with the new plastic-making technology. The nonprofit Texas group intends to post blueprints for “The Liberator” (pictured) online this week. The Liberator may look like a toy, but “this gun can fire regular bullets,” Schumer said, calling for legislation outlawing the technology’s weapons potential. “Security checkpoints, background checks and gun regulations...