Attorney General Eric Schneiderman made the announcement Saturday after visiting a gun show in Rochester.
The new agreements bring the number of operators that have signed on to Schneiderman's model gun show procedures to 26.
The model procedures involve putting tags on all the guns brought to the shows by private sellers. Those tags are checked later to determine whether gun buyers underwent a background check.
Operators also must take steps to prevent unregulated sales outside shows, including notifying law enforcement so they can patrol nearby.
Schneiderman's tour of the Rochester Gun Show was his first visit to a gun show since taking office.
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