member of the Comanchero motorcycle gang has been charged with threatening to shoot a blackmail victim in Adelaide.

Crime Gangs Task Force officers arrested the 34-year-old man from Seacliff for blackmail and making unlawful threats between May and July this year, police said in a statement on Friday.

Police will allege the member of the gang's South Australian chapter threatened to shoot his victim while making demands for an outstanding debt.

They raided two properties earlier on Friday and seized "a number of items of interest" relating to the alleged offences.

The man was refused bail and will appear in the Adelaide Magistrates Court on Friday.