4 ms·Metal detectors obsolete?by gunnm 13y agoMetal detectors obsolete?jcomis 13y agonot unless they start printing plastic bullets and casings too.RyJones 13y agoYou mean like a tround ( http://en.wikipedia.org/wiki/Dardick_tround http://en.wikipedia.org/wiki/Dardick_tround ) or the delrin bullets used for indoors practice?