A 23-year-old man, suspected to be a sharpshooter of the Neeraj Bawana gang, was arrested on Sunday, the police said.
Accused Tarun alias Tori is a resident of Dariyapur village in Bawana Industrial Area, they said.
A pistol loaded with a live cartridge has been recovered from the possession of the accused, Deputy Commissioner of Police (Outer-North) Gaurav Sharma said.
The police also said they have been closely monitoring the activities of the gang in the city.
After the police received a tip-off, they zeroed in on Tarun who is a close associate of Neeraj Bawana, they said.
Last year, Tarun, along with his accomplices, had allegedly tried to kill one Gaurav, who is a shooter of rival gangster Rajesh Bawana, outside a court in Rohini. He was nabbed by the police, they added. The police further said that Tarun is involved in two other cases as well.