The men hail from Virginia. The police also confiscated 110 firearms after an undercover operation, which lasted for about eight months.
According to police, Clive Dixon was the "ringleader" of a group that allegedly participated in sales of 15 semiautomatic assault rifles, 65 pistols and three shotguns with an undercover NYPD detective. The police launched the probe in March after receiving a tip.
The 28-year-old Dixon, of Virginia Beach, as well as his three alleged cohorts - Emmanuel Dentmond, Teal Holt and Antonio Williams - face 284 felony gun charges.
Addressing a press conference, Manhattan District Attorney Cy Vance Jr talked about some of the worst mass shootings in the history of the country.
"In this pile you'll find the .223-caliber semiautomatic assault rifle - the same style used to gun down most of the 26 students and teachers at Sandy Hook Elementary school in Connecticut, 12 theatergoers in Aurora, Colo., and the victims of the Beltway sniper in the Washington, D.C., area in 2002," Vance said.