The rules were developed after Schneiderman charged 10 gun sellers with failing to run required background checks before making sales to the undercover buyers at six shows around New York state.

WSJ: Most NY gun show operators agree to new rules

Twenty-three operators, representing more than 80 percent of the shows across the state, will abide by the "Model Gun Show Procedures" developed after undercover operations in 2011 showed buyers could obtain weapons without going through required background checks, Schneiderman said.

WSJ: Most NY gun show operators agree to new rules

The other measures would expand required federal background checks for firearms buyers, increase federal penalties for illegal gun trafficking and boost school safety money.

WSJ: Biden, speaking in NY, supports assault weapon ban