Improvised firearms are firearms manufactured other than by a firearms manufacturer or a gunsmith, and are typically constructed by adapting existing materials to the purpose Improvised firearms may be used as tools by criminals and insurgents and are sometimes associated with such groups other uses include self-defense in lawless areas and hunting game in poor rural areas

Machine Guns ?

Homemade submachine guns are often made by copying existing designs, or by adapting simple, open-bolt actions and leveraging commonly available hardware store parts Improvised firearms are most commonly encountered in regions with restrictive gun control laws like the united states