There is the possibility of manufacturing caseless ammo. An exotic replacement for the firing pin isn't strictly necessary. A firing pin is too small to activa

There is the possibility of manufacturing caseless ammo. An exotic replacement for the firing pin isn't strictly necessary. A firing pin is too small to activate a metal detector. At least, the government thinks so, because guns are required to contain a minimum amount of metal for this purpose. The current stories are neglecting to mention this, but an earlier Forbes article reported that the Liberator contains a 6 ounce piece of steel to remain compliant with the law on undetectable firearms.