Three members of the Mongrel Mob were arrested in Mataura on Friday following a serious gang-related assault.
The men were arrested "following the execution of a search warrant at the gang's headquarters in Albion Street", police said in a statement.
"Two men, aged 33 and 36, have jointly been charged with two counts of unlawful possession of a firearm. They appeared in Invercargill District Court on Saturday.
"The third man, a 30-year-old, was charged with assault with intent to injure."
He is scheduled to appear in Invercargill District Court on 18 August.
The arrests were made as part of Operation Cobalt, a nationwide crackdown on organised crime.
Detective Inspector Stu Harvey encouraged members of the public with any information about gang activity to get in contact with police, using the non-emergency 105 number.
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"Police have absolutely no tolerance for this type of offending in our communities," he said.
"As part of Operation Cobalt, we will continue to have a significant focus on targeting and disrupting this unlawful gang activity in Southland."
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