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WASHINGTON - Congress has approved a 10-year extension of a ban on plastic firearms that can evade metal detectors and X-ray machines. But it has defeated gun-control advocates' push for tougher restrictions.

The Senate used a voice vote Monday to renew the ban. The House did the same last week, so it now goes to President Barack Obama for his signature.

Republicans blocked a proposal by New York Democratic Sen. Chuck Schumer. He wanted to require that plastic guns have an undetachable part made of metal.

Some plastic guns follow the law by including a metal piece that can be detached.

Democrats say 3-D printers that can produce plastic guns make tighter restrictions necessary. Republicans say Schumer's idea should be studied.

Unless Congress acted, the prohibition would have expired at midnight.