Police located drugs, a samurai sword, knuckle knives, imitation firearms, and a Victoria Police badge after executing a warrant in Burnside on November 6.
Police attended an address in Billungah Place about 9.20am as part of an ongoing investigation.
A 36-year-old man from Burnside was arrested and officers searched the property.
During the search police seized four imitation firearms, a samurai sword, two knuckle knives, a 3D Printer, various 3D printed firearm parts, three unfinished firearm barrels, 24 pieces of cartridge ammunition, a Victoria Police badge, a small amount of heroin and four cannabis plants
The 36-year-old has been charged with possess equipment for manufacture-trafficking drug of dependence, possess pre-cursor chemicals, trafficking heroin, possess equipment for manufacture firearms, cultivating cannabis, possess heroin, possess imitation firearms and possess cartridge ammunition.
He was bailed to appear before Melbourne Magistrates Court on January 30.
Anyone with information about illicit firearm activity is urged to contact Crime Stoppers on 1800 333 000 or www.crimestoppersvic.com.au.