In a statement yesterday, Mayor Michael Bloomberg's administration hailed the undercover operation as proof its hard line on guns and controversial stop-and-frisk police tactics -- work.
"New York is the safest big city in the nation," said Bloomberg, an outspoken advocate for tougher gun laws across the United States.
"But year after year, illegal guns flow into our city from states that don't have common-sense laws that keep guns out of the hands of criminals," he said.
The guns seized originated from the southern states of North Carolina and South Carolina -- a 12-hour drive to New York along Interstate 95.
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No permit is needed to buy a rifle or shotgun in either state, and South Carolina doesn't require permits for a handgun either.
Sales of assault rifles in both states are unrestricted.
Among the weapons seized included a fully automatic Cobray nine-millimeter submachine gun with 30-round high capacity magazine and three assault pistols with flash suppressors and high-capacity magazines that hold 30-plus rounds.
Of the 19 people charged, three were already in custody on unrelated charges. The others were picked up in New York, North Carolina and South Carolina in a series of arrests from August 2.
Stung by the rejection of New York's controversial stop-and-frisk law last week by a federal judge who deemed it unconstitutional, Bloomberg's administration stressed how one suspect expressed jitters about the tactic in a phone call picked up by an court-authorised wiretap.