If the government would stop trying to illegally remove guns from the American people then this wouldn't even be an issue. The thrust of this has nothing to do with the materials guns are made of, how they look, the number of rounds they fire, reducing crime or whatever they're pinning it to today. It is a means to an end which is unassailable and unchallenged control of this country. The very reason the Founders established the 2nd Amendment was to prevent such action and allow for recourse against the same. Guns that can't be detected can't be taken away. Self defense is an inalienable human right no matter how many laws Congress passes to relieve us of it.
If you doubt their intent take another look at David Koresh in Waco or Randy Weaver's family at Ruby Ridge. Guns, Crime and Freedom by Wayne LaPierre is a good starting place.