A man who admitted making nail bombs at his West Yorkshire home has been jailed for 11 years.
Terence Gavan, 38, who the Old Bailey heard showed a strong hostility towards immigrants, was arrested by police in a raid at his home in May 2009.
The bus driver's arsenal of weapons and explosives included home-made shotguns, pen guns and pistols.
Gavan, from Batley, also pleaded guilty to six counts of having or collecting documents useful in terrorism.
Sentencing Gavan, Mr Justice Calvert-Smith said his case was "unique" because of his long and persistent manufacture of guns and explosives.
Gavan, who the court heard was a former member of the BNP, pleaded guilty to 22 charges at Woolwich Crown Court in November.
Police discovered 12 firearms and 54 improvised explosive devices, which included nail bombs and a booby-trapped cigarette packet, at the home Gavan shared with his mother.
He told detectives he had "a fascination with things that go bang", the Old Bailey heard.
Gavan's arsenal included nail bombs and a booby-trapped cigarette packet
After the case, head of the North East Counter Terrorism Unit Det Ch Supt David Buxton said Gavan posed a significant risk to public safety.
"Gavan was an extremely dangerous and unpredictable individual," he said.
"The sheer volume of home-made firearms and grenades found in his bedroom exposed his obsession with weapons and explosives.
"However, he was not simply a harmless enthusiast.
"Gavan used his extensive knowledge to manufacture and accumulate devices capable of causing significant injury or harm."
A BNP spokesman would not comment on whether Gavan had been a member of the party.
But he told BBC News that Gavan's offences were "serious" and the sentence given to him was "correct".