A man who police say is linked to a bikie gang has been remanded in custody after officers allegedly found guns and a drug lab at his western Sydney home.

Operation Apollo is a police taskforce examining gun crime across Sydney.

On Saturday afternoon officers attached to the operation raided a house on Collins Street in St Marys.

Police say they found a sawn-off shotgun, a loaded sawn-off rifle, a replica revolver and a replica rifle at the house.

They also allegedly located a stolen motorcycle along with chemicals and equipment used to make methamphetamine.

A 24-year-old man who police say is an associate of the Lone Wolf bikie gang was arrested at the house and taken to St Marys Police Station.

He was then charged with 10 offences.

The man faced court and was ordered to remain in custody.

He will return to court again later this week.

Police from the state's Chemical Operations Unit are continuing their investigations, saying more charges are likely to be laid.