Just for reference...
All the shows I have been to in New York have the requirement of a check for ALL firearm purchases, both long arms and handguns. We have a permit system for handgun ownership but not one for long arms where you can easily do FTF sales across the state with no paperwork. You are not allowed to circumvent the check by doing the sale in the parking lot outside the show.
It seems to work fine.
Seems to work fine for what? The cost to operate the system is tremendous, the burden is carried by the law abiding people of NY, the criminals simply ignore the "mandatory registration" and the registration of firearms and the related trace data has been used to solve....wait for it.... ZERO crimes since it was enacted in 1936.