The National Instant Criminal Background Check System, or NICS, in New Jersey is currently not approving any firearm transfers. Seeing as New Jersey law requires anyone seeking to purchase a firearm from a dealer with a Federal Firearms License to pass a background check, it is currently impossible to purchase a gun in New Jersey from a gun shop. With the background check system unreachable, no one can transfer a handgun, PERIOD.
Background checks being flooded show just how hard it is to obtain a gun these days.
Presently, 17 states regulate private firearm sales at gun shows. Seven states require background checks on all gun sales at gun shows (California, Rhode Island, Connecticut, Oregon, New York, Illinois and Colorado). Four states (Hawaii, Maryland, New Jersey, and Pennsylvania) require background checks on all handgun, but not long gun, purchasers at gun shows. Six states require individuals to obtain a permit to purchase handguns that involves a background check (Massachusetts, Michigan, North Carolina, Iowa, Nebraska). Certain counties in Florida require background checks on all private sales of handguns at gun shows. The remaining 33 states do not restrict private, intrastate sales of firearms at gun shows in any manner.
I'm not sure about other places but gun shows here in Missouri are required to have the NICS background check.