Cameron Williams was practically an open book when police searched the home on Wednesday morning after serving him with firearms and weapons prohibition orders.

When asked if he had anything in the house to declare, Williams walked police to various parts of the house and shed, alerting them to items of interest.

He pointed out three pistols, all of which appeared to have been modified to shoot ball bearings or .22 calibre bullets.

In relation to the first pistol, Williams allegedly told police "[it's] mine, the electric part was faulty so I removed it and tried to make it so it shot ball bearings."

He told officers he'd found the second pistol "in a council pickup" but it was not his, and said he'd forgotten the third pistol was even there: "I thought it had been thrown out".

Officers then found an old .22 calibre rifle under a rag in the front corner of the shed, however Williams claimed he'd never seen it before and didn't know it was there.

Police also discovered almost a gram of ice in the shed, prompting Williams to confess "I'm a crackhead, it's ice. It's mine for personal use."

Inside the home, Williams led police to his bedroom where officers found steroids and knuckle dusters.

Williams was arrested and taken to Lake Illawarra Police Station where he was charged with 10 offences and remanded in custody.

Police opposed Williams' application for bail in court on Thursday, with Sergeant Amelia Wall saying the case against him was a strong one.

"The community needs to be protected from people like Mr Williams who possess unauthorised firearms," she said.

Defence lawyer Danny Lagopodis said Williams would agree to strict bail conditions if released.

He said Williams' ran a mechanic business from the family home and was a carer for his elderly parents, both of whom had significant health issues and relied on their son for day-to-day care.

"He doesn't have a lengthy record and there's nothing of a similar nature [on it]," he said.

"He tells me the pistols were all plastic, he was collecting them. They weren't used for the commission of any offences at all."

Magistrate Jillian Kiely refused to release Williams from custody, noting he faced a lengthy jail sentence if convicted.

The case was adjourned to June 10 for police to serve the brief of evidence on Williams' legal team.