They supplied items of clout, kudos and lethal force to criminals. They were 'merchants of death' as one was branded, feeding gangs with firepower.
Mac-10s and Uzi sub machine guns from war zones and Soviet bloc countries helped fuel Greater Manchester's gang wars in the 80s and 90s, before a new wave of armourers began converting gas-firing pistols from Eastern Europe after the millennium, triggering another deadly cycle.
Police cracked down on those supply lines, but now the hacking of EncroChat - the private messaging system dubbed Gangster Whatsapp - has exposed the new breed of armourers who stepped into the void.