I find it interesting that the ATF&E is concerned about the ability to get past X-Ray or Magnetometers with firearms printed out of non metallic materials. My question is how do you get metallic bullets and cartridge cases past the same X-ray and magnetometer equipment. A gun without ammunition is simply a paper weight. In addition to airports, you will find metal detection devices at courthouses, city halls, and various other venues. Until someone comes up with non-metallic ammunition, this is a threat that simply does not exist.