Police seized a gun and ammunition during a raid on a house in Blacktown.
Blacktown police detectives raided a house in Wirilda Way about 5pm on Friday, August 31.
Officers allegedly located a double barrel shotgun, 77 rounds of ammunition, a sling shot and drug paraphernalia.
The items were seized and are currently undergoing forensic analysis.
At this stage, police have not made any arrests or laid any charges.
Anyone with information which might assist police can contact Blacktown police or Crime Stoppers, 1800 333 000.