Robert Weir, 56, stored the weapons at the Sandpoint Marina in Dumbarton.

Firearms officers who searched the unit in March 2025 discovered a shortened loaded Russian-made shotgun and a Japanese shotgun which was also loaded, and two handguns with ammunition.

Weir, of Dumbarton, was sentenced at the High Court in Glasgow after admitting multiple firearms offences. He also pleaded guilty to possessing 1.7kg of cannabis at his home with a street value of £17,202.

The charges were aggravated by the accused having committed the crimes while on bail.

Weir’s crimes began to unravel when a police search of his home revealed the cannabis in four vacuum-sealed bags, digital scales and two swords. Later the same day, officers searched the metal shipping container which was being rented by Weir and recovered the haul of weapons.

Forensic analysis of the Russian shotgun showed it was designed to discharge 16-bore shotgun cartridges and was in working order. The Japanese shotgun was constructed to discharge 12-bore cartridges and was constituted as a firearm.

Prosecutor Sineidin Corrins said: “This was an important recovery of weapons that had the potential to cause significant harm.

“These weapons have now been taken out of commission and Robert Weir will spend a lengthy time in prison as a consequence of his crimes. This case underlines our commitment to continue working with the police and other agencies to ensure that these crimes are detected and those responsible prosecuted using all measures at our disposal.”