Like 66 year old Willam Hughes.
Police found 111 weapons while the army had to dispose of a deactivated grenade at his home in Gwersyllt, Wrexham.
His barrister told Caernarfon Crown Court "the world was a very different place" when Hughes' interest began.
Hughes also had 24 shotguns and 37 rifles at his house.
He also admitted a charge of possessing ammunition.
Simon Medland, defending Hughes, said his client never had any intention of using the guns and the law had changed since he started collecting, particularly after the Dunblane school shootings in 1996.
He added: "This is the first time he's been before the courts.
"When Mr Hughes began his interest in firearms the world was a very different place in its approach to guns."
Some of the guns dated back to the 18th and 19th Centuries and a large number of weapons at the property were held legally, the court heard.
But Judge John Rogers said Hughes had been aware of the change in the law on guns and sentenced him to five years in jail.
He told him: "You, I'm sure, now appreciate the gravity of storing at your home so many prohibited firearms and ammunition."
So, a gun nut. A pensioner, no previous convictions, no suggestion any guns fell into the wrong hands or were used illegally. Five years.
That's what you get for throwing a sleepy six-year-old off a 14th floor balcony.
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