Police have charged a member of the Hells Angels motorbike gang over a gun war between rival Sydney bikies.

The 23-year-old man is accused of firing a gun outside an Oporto fast food restaurant at Merrylands in late October 2011.

Police linked the incident to a dispute between the Hells Angels and the Nomads following four other public shootings at Holroyd, Granville, and Canley Heights the same month.

Strike Force Felix was formed to investigate the shootings and has since been expanded to include a dozen similar shootings, three arson attacks and one robbery between October 2011 and January 2012.

The alleged Hells Angels associate has been charged with discharging a firearm intending to cause grievous bodily harm and firing a gun in a public place.

He is in custody and will face Campbelltown Local Court later this month.

Strike Force Felix detectives have now arrested 23 people and laid a total of 131 drugs, firearm and other charges.

They have also executed 16 search warrants, during which they seized 22 firearms and large amounts of ammunition, along with drugs such as cannabis, methylamphetamine and Ecstasy.

The investigation is ongoing and police are urging anyone with information to contact them.