Whether Americans will be able to download plans to build their own plastic guns at home will be debated in federal court yet again this week, with Pennsylvania Attorney General Josh Shapiro and eight other state attorneys general siding squarely against the idea.On the other side is Cody Wilson, owner of Texas companies Defense Distributed, DEFCAD and Ghost Gunner, which produce downloadable software and other items at the heart of the "3D printable gun" debate.