Police said they took another gun off the street on Sunday after officers searched a farebeater in Brooklyn.
Authorities arrested a 17-year-old girl after they noticed her stroll past the turnstile at the Kingston Avenue and Throop Avenue subway station in Bed-Stuy at around 3:20 p.m.
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Plainclothes transit police patrolling the C train platform noticed the teen beat the fare and approached her.
A police spokesman said the girl was not able to provide them with ID, prompting them to arrest her.
Once they began to search her, however, they found an unloaded revolver in the teen's bag.
The teen was charged for skipping the fare and criminal possession of a weapon.