NSW man arrested after the murder of underworld figure Gavin Preston

Search warrants were executed across Sydney in Bradbury, Yagoona and Campbelltown at 6am on October 25.

A 22-year-old Bradbury man was arrested without incident, police said.

Preston, 50, had been released from prison earlier in 2023 and was eating at a Keilor café with business partner Abbas 'AJ' Maghnie, 26, when the gunman approached at 10.20am on September 9.

Maghnie escaped the scene with a non-fatal gunshot wound.

A crowd of patrons witnessed the attack but no onlookers were physically injured, police said.

The alleged getaway car, a black Audi, was found burnt-out nearby. The alleged offender's subsequent getaway car, a black Volkswagen Polo, was also found burnt-out.

"This has been a very challenging investigation," detective superintendent Janet Stevenson said.

"This is a significant arrest and an important step forward, however this investigation remains live and is far from over," she said.

"This shooting was an extreme display of violence in a public setting and those involved had complete disregard for innocent members of the community."

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Detectives are continuing to treat this as a targeted attack and the investigation remains ongoing, police said.

Officers are keen to speak to anyone who witnessed the incident or the vehicle fires, as well as anyone with information about those responsible for the shooting and the motivation behind it. This information can also be provided anonymously.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au