A man has been charged with the daylight execution-style murder of a 24-year-old outside his southwest Sydney home.

Marvin Oraiha was shot dead by a gunman in the driveway of his Elizabeth Hills home around 4pm on May 22.

A short time later, two cars linked to the crime were found burnt out at nearby Green Valley and Bonnyrigg Heights.

Strike Force Hackenburg detectives last month released CCTV of two men they wanted to question as well as footage of three vehicles as part of an appeal for public information.

NSW Police said strike force detectives — with help from Raptor Squad officers – raided a home at Roselands at dawn on Wednesday and arrested a 22-year-old man.

He was charged with murder, car theft, possession of an unauthorised pistol and participating in a criminal group.

He was refused bail to appear before Bankstown Local Court on Thursday.

Police then conducted six other raids at Edensor Park, Green Valley, Yagoona, Liverpool, Merrylands and Guildford.

Police say they seized ammunition, an extendable baton, gel-blasters, a Taser, cloned registration plates, substances believed to be prohibited drugs, clothing, more than $3000 in cash and mobile phones relevant to their investigation.

Investigations under Strike Force Hackenburg continue.