A statewide manhunt has been launched for a NSW Police civilian employee wanted for allegedly taking weaponry from a police armoury.


The 38-year-old man worked in the armoury and was under investigation for serious firearms offences, a police spokesman told AAP on Friday.


"He's been misappropriating weapons and weapons parts from the facility," he said.


A number of weapons were found at the man's home on Thursday during a police search but the man had not been seen since, the spokesman said.


The spokesman said the wanted man was from the Tuggerah Lake area on the NSW Central Coast.


He said the matter was related to another case in which a father and son were charged on Thursday after a machine gun, a silencer and $20,000 in cash were seized in police raids south of Newcastle and in western Sydney.


Police later released the man's name as Alan James Cumberland and said he was an armourer with the force and lived at Berkeley Vale.


AAP