A heroin and crack cocaine peddler was sent to jail for four years for possessing a deadly sawn-off shotgun.
Connor Ashton's DNA was found on the weapon after police raided a house on Chudleigh Road in Old Swan on August 15, last year.
Also discovered was a handgun, which the 24-year-old also handled, and a Uzi submachine gun along with a stash of Class A drugs.
Ashton's DNA was also seen on the interior of one of the barrels, but none of the firearms were linked to any known discharges in Merseyside.
This case comes after the jailing of James Foat, 24, of Molyneux Road, Kensington, and Kyle Melia, 24, of Killington Way, Kirkdale, for seven-and-a-half years and five years respectively for their part in the seizure.
Judge Neil Flewitt, QC, told him: "I'm satisfied you did handle that shotgun and handled in such a way including breaking it open and gaining access to loading cartridges.
"You had some contact with the handgun. Contact with the sub machine gun, I can't be sure.
"You have a record that has a large number of convictions for dealing Class A drugs.
"This was a genuine sawn-off shotgun, you had no legitimate purpose for it.
"It was found with ammunition suitable for [cartridges] being discharged for it."
Judge Flewitt said Ashton had a criminal record that "makes for depressing reading."
Most recently he was handed seven years in prison for a different offence, and he committed his latest crime while he was out on licence for that offence.
Judge Flewitt added: "You are still 24 years old, there's still time for you to turn your life around.
"You have made good progress with your [recent] community order.
"I accept you have had a difficult life, you should be grateful to your grandparents, but you have let them down badly once again."
Ashton's first conviction was at the age of just 14 when he was caught with crack cocaine with intent to supply.
Later that year, he was jailed for committing the same offence.
Ashton also has previous for dealing heroin.
Barrister John Rowan, defending the Knotty Ash man, said: "He has been for the best part of his 20s in prison, he is heading down the path now for a level of institutionalisation.
"He has wasted years and years of his life in custody environment.
"He was taken away from his mother when he was a young child, she has significant problems with drugs."
Ashton was taken in by his grandparents, who are "continually disappointed in the decisions he makes."
Mr Rowan added: "We have a young man of not particularly high intellect, he struggled in school academically and [with his] behaviour.
"He was without a mother and father, that caused some resentment...while his grandmother and grandfather did their best for him.
"He left school with no qualifications.
"He's still relatively young and he tells me there's a renewed determination to come out of prison a better person."
Ashton, whose granddad was in the public gallery, was convicted after a trial of possession of a swan-off shotgun.
Detective Inspector Jennie Beck said: “Our communities should feel reassured that Ashton, Foat and Melia are now all set to spend the coming years in prison.
"Anyone storing firearms in Merseyside is putting the very communities they live in at serious risk.
"We will continue to take action to locate and seize firearms from the hands of those people, and will take them off the streets permanently so that they cannot be used to cause fear, injury or worse.
“We will keep arresting and putting before the courts those people with so little regard for the safety of others that they are prepared to store, carry and use guns."
Police have asked the public to contact them with information by ringing Crimestoppers anonymously on 0800 555 111, or on Twitter, @MerPolCC, call 101 or @CrimestoppersUK anonymously on 0800 555 111.
