'In the world of 3D-printed guns, one figure looms large: ‘JStark1809’. It is difficult to overstate his influence. He designed the FGC-9, one of the most popular 3D-printed guns in circulation. He also created Deterrence Dispensed, an influential network of gun designers. Since his death in 2021 he has been revered as a quasi-martyr for the right to bear arms, resulting in a cult-like following within the 3D-printed gun movement.'

Improvements in technology and information sharing have transformed PMFs from crude, impractical homemade devices of limited value to most criminals into highly functional weapons that are increasingly viewed as viable substitutes for factory-built firearms. The effectiveness of national and international small arms control regimes are gradually being eroded; the lack of serial numbers on such weapons, for example, undermines tracing efforts that have been a cornerstone of investigations.