amounamoun airport as schools because now the guns must contain a metal part. it s illegal to have a firearm with less than 7 ounces of metal in that firearm. it s about gaining a foothold into the digital manufacture of weaponry. reporter: after a brief delay, the house voted today on a bipartisan basis to reauthorize the undetectable firearms act that was set to expire next week. the legislation now goes to the senate. the atf says the law which dates back to 1988 was forward-thinking 25 years ago, but even with the renewal it may not go far enough because the metal is only cosmetic and not part of the firing mechanism. instead of having a metal bloc that s easily removed from that firearm, forward thinking would be to have metal portion that was part of the functioning of that firearm. reporter: a leading senate democrat says the law s renewal ace no-brainer and he s vowing to make modifications that will