Large-Scale Meth Lab Discovered In Sydney Penthouse, Assault Rifle Seized

Five men have been arrested after police allegedly discovered a large-scale 'ice' lab in Sydney's inner west.

Detectives from the State's Drug and Firearms Squad executed a crime scene warrant at a unit on Hilts Road, Strathfield just after midnight on Friday, where they found a clandestine laboratory in the process of manufacturing the drug ice.

Officers seized about 5kg of ice and arrested four men, aged between 26 and 47, as they attempted to flee the area.

The ice seized has an estimated street value of between $750,000 and $2.5 million.

At about 1am the same morning, detectives executed a warrant at another unit on Carter Street in Lidcombe.

At the unit an M4 carbine automatic assault rifle, 9mm pistol, $11,000 cash, drug paraphernalia and methylamphetamine were allegedly seized.

A 23-year-old Queensland man was arrested at about 10pm on Thursday following a vehicle stop on Carter Street, during which he was allegedly found in possession of $66,000 cash.

The raids follow an investigation by Strike Force Bardoo, which was established in February to investigate an alleged criminal syndicate involved in the large-scale manufacture and supply of methylamphetamine.

The lab is in the process of being dismantled, police said, and the men arrested were taken to Auburn Police Station where they are assisting with inquiries.

All five men were refused bail and are due to appear at Burwood Local Court on Friday.