Paul Edmunds, 66, falsified paperwork to import illegal weapons at Heathrow.
But while 17 pistols linked to Edmunds have been taken out of circulation, police are still looking for 207 weapons.
The "firearms fanatic" handcrafted bullets to be used for vintage guns like Smith & Wesson revolvers and antique, obsolete-calibre revolvers - including St Etienne.
A weapon imported on November 14, 2013, was used five weeks later in the Boxing Day murder-shooting at the Avalon nightclub in London.
The genuine antique weapons imported by Edmunds were converted by him into killing machines because he was able to manufacture bullets.
In turn, Surdhar passed them on to a notorious Birmingham crime group called the Burger Bar gang, who kept some and sold others to underworld contacts.
Lying to officials about the age of guns, he falsely claimed many were antiques and therefore allowed in the United Kingdom because there is no commercially available ammunition.
One round of unfired ammunition was found on the ground at the murder scene of 18-year-old Kenichi Phillips, who was shot dead in a Birmingham street in March 2016.
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Edmunds was also found guilty on two counts of perverting the course of justice in relation to doctoring his firearms register in an attempt to cover his tracks.
The licensed gun dealer used his "encyclopaedic knowledge" of firearms legislation to exploit loopholes and smuggle hundreds of banned weapons from the US.
Detective Constable Phil Rodgers from West Midlands Police Regional Crime Unit, who led the investigation, said: "They were like the Breaking Bad of the gun world - on the face of it both decent men but using their skills and expertise to provide deadly firearms".
Four of Edmunds' bullets were recovered from the victim's body.
He was remanded in custody to be sentenced on December 20. Their actions have had a devastating impact on communities by fuelling violent crime, leading to fear and bloodshed.
"Surdhar also had an armoury at his home and we believe Edmunds was teaching him the art of bullet making". We didn't believe him and clearly neither did the jury.
"Our investigation has undoubtedly prevented many more firearms and countless rounds of ammunition getting into criminal hand and in all likelihood saved lives". It's hard to overstate the significance of these convictions: "we have cut off a major firearms supply chain and one that's been used by risky men to commit serious offences".
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