The Democratic governor signed the new law Thursday in Trenton.
It's the latest gun-control measure enacted by the Democrat-led Legislature and governor since he took office in January. Murphy signed a half-dozen bills in June aimed at tightening already strict gun laws.
The new law bars the purchase of separate parts or kits that could be used to manufacture a firearm not traceable by law enforcement. Lawmakers say the measure will "arm our court system" with the ability to block criminals from using technology to make weapons.
Murphy called for a new round of gun control measures in response to Pittsburgh synagogue shooting last month.
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