Three men have been arrested after officers conducted multiple raids across Sydney, allegedly linked to South-East Asian crime gangs.

Police seized 415 kilograms of prohibited drugs, three pistols, more than 300 rounds of ammunition, $450,000 in cash, and a ballistic vest.

Five search warrants were executed at alleged safe houses in Mays Hill, Bankstown, Campsie and Bonnyrigg Heights.

The drugs seized totalled 287 kilograms of methylamphetamines, 47 kilograms of cocaine, 81 kilograms of heroin, and 838 grams of MDMA.

The drugs add up to a total of $260 million in street value.

"Seizing nearly half a tonne of drugs in a unit, seizing a number of semi-automatic firearms that are imported, I think that shows the scale of this organised crime network," Detective Superintendent Peter Fa

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