In Washington a senate vote to renew an expiring ban on plastic firearms capable of evading metal detectors, and X-ray machines is shaping up as a bittersweet moment for gun control supporter.

The vote to extend the prohibition on plastic guns for another decade responds to a growing threat from steadily improving 3-D printers that can produce such weapons. But gun control advocates seem sure to lose an effort to impose additional, tougher restrictions on plastic firearms.

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