A father and son have been accused of supplying deactivated guns and kits to make them live to criminals.
William Greenwood, 76, and Mitchell Greenwood, 42, both of Catchills Farm, South Wingfield, Derbyshire, ran an antiques shop in Long Eaton.
Derby Crown Court heard they sold an undercover police officer 22 guns and parts to make them fire again.
Both men deny a charge of conspiracy to convert deactivated firearms into live weapons.
Witnesses, including a serving prisoner and other men previously jailed for
gun crime offences, told police they had bought hundreds of weapons from the
Jurors were told the pair had been licensed gun dealers and that the family had run their company since 1974.
The prosecution said that both a long term police operation and investigators
from ITV's The Cook Report discovered they also offered the items needed
to restore deactivated guns to their original state.
The court was told that during an undercover operation between 1998 and 1999,
the Greenwoods offered a detective an array of machine guns and pistols.
They had once joked that if he bought 10 French-made MAB handguns he would be given one
In February 1999, the officer returned and handed over £2,040 in exchange for
three carrier bags filled with 22 MAB guns, enough barrel tube to convert the
weapons, a tool to shape the barrels and ammunition, the court heard.
Prosecuting, Anthony Russell QC, said the Greenwoods had been "prepared to turn a blind eye to the ultimate, and obvious, final use of these firearms".
The court was told officers immediately raided the premises, seizing hundreds of deactivated guns and equipment.
The case continues.