Scott Matthew King, 29, was arrested during the search warrant executed at his property in Portland's Richmond Street on Friday.

Police found in his bedroom seven loose .22 calibre bullets, a rifle ammunition clip and open boxes of ammunition - none of which was properly secured.

King has never held a firearms licence and is a prohibited person under the Firearms Act.

He is expected to be placed on a community corrections order in about a fortnight after he pleaded guilty to firearm offences and other charges in Warrnambool Magistrates Court on Monday.

The court heard his offending dated back to 2019 when he was intercepted driving an unregistered silver Commodore in Portland. Registration plates were not fixed to the vehicle.

King tested positive to a preliminary breath test but then refused to accompany police to the Portland police station for an evidentiary breath analysis.

The court heard it was his second offence of refusing a breath test since 2012, meaning he would lose his licence for a minimum four years.

Then on April 4 this year, King entered a service station in Portland's Percy Street where he dropped a small bag containing .72 grams of methamphetamine.

He left the store without realising and a supervisor contacted the police.

King was intercepted walking in Percy Street on April 7. He was found in possession of a 25-centimetre knife, 22 grams of cannabis and .61 grams of ice.

While on bail for those offences, King persistently breached a court order and failed to pay $84 for a two-night stay in a Portland motel.

He was arrested at his home during the police raid on Friday and will be sentenced on July 13.

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