Hello! welcome back to war! After almost 5 years of warfare against the "system" I've been trought everything, literally, everything. Passing a gun trought security, if it could be only by the scanner, ok, you do it cover on old x rays films, however the metal detector is "almost" uncrossble. the relativety between mass and proximity, would demand that only 5 inches of metal cross the metal detector on a less than 1 meter parallel barrier. I've been trough everything the "system" has about it, also nylon 66, and trough dozens of scientific papers. As a conclusion, of my research, I have a theory; the theory is based on unmagnetize the metal trought this procedure (be aware that metal has also a thermal reading on detection)