Benalla police are investigating the importation of items which can be modified for use as gun silencers.
Officers received information from Australian Border Force about solvent traps, which can easily be fitted to the muzzle of a firearm and used to suppress noise.
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Officers have warned people involved in gun and gun part importation face up to 10 years in jail and hefty fines.
They want to speak to anyone with information about the illegal use or importation of the devices.