Police are still searching for many of the Mac-10s converted for sale in Grant Wilkinson's gun factory.
Detectives estimate 40 weapons are still on the streets and have offered a £10,000 reward for information to help find them.
The replica submachine guns were bought legally, turned into deadly weapons and sold into gangland UK.
Since 2004 they have been used in more than 50 shootings, including the murder of 15-year-old schoolboy Michael Dosunmu and the robbery in which Pc Sharon Beshenivsky was killed.
The Metropolitan Police said 50 Mac-10s have been found around the country from Wilkinson's batch of 90.
Detective Superintendent Gary Richardson said: "These guns have been linked to 52 shootings, including nine murders, eight of which occurred in London.
"They are extremely dangerous and I would urge anyone who thinks they may have seen one, or knows someone who is hiding one, to tell us and stop more people being hurt."
Claudia Webbe, chairwoman of the Trident independent advisory group, said: "We can see very clearly the devastating impact of this heinous crime, particularly and disproportionately, although not exclusively, on black communities.
"Here we have an armoury factory in the suburbs of Berkshire creating deadly weapons that are clearly ending up in the hands of 17, 18, 19-year-olds in inner city urban London.
"The availability of these weapons is clearly fuelling violence on our streets. They have caused devastating shootings, murders and mayhem."