The investigation focused on drug trafficking in Terrace, B.C., located 1,300 kilometres north of Vancouver.
Police found more than 500 pot plants and a kilogram and a half of cocaine, as well as ecstasy, hashish, magic mushrooms and prescription drugs.
They say some of the guns were loaded and readily accessible when they conducted the raids.
Insp. Dana Hart of Terrace RCMP says the organized crime group involved posed a significant threat to the community of 11,000.
Dave Edwardsen is facing 11 drug trafficking and firearms offences and RCMP expect charges are coming against others.
For more pictures of the RCMP seizure: