Original sentence: An improvised firearm is a firearm manufactured other than by a firearms manufacturer or a gunsmith), and is typically constructed by adapting existing materials to the purpose.Improvised firearms are commonly used as tools by criminals and insurgents and are often associated with such groups.Improvised firearms are most commonly encountered in regions with restrictive gun control laws.Improvised firearms are not solely the province of the criminal element.Other uses for improvised firearms include self-defense in lawless areas, or in poor rural areas for hunting game.They are also used by insurgents.They range in quality from crude weapons that are as much a danger to the user as the target, to high quality arms produced by cottage industries using salvaged and re-purposed materials
Edited sentence: An improvised firearm is a firearm manufactured by someone who is not a regular maker of firearms (such as a firearms manufacturer or a gunsmith), and is typically constructed by adapting existing materials to the purpose.Improvised firearms are commonly used as tools by criminals and insurgents and therefore often associated with such groups.Improvised firearms are most commonly encountered in poverty stricken regions with restrictive gun control laws.Improvised firearms are not solely the province of the criminal element, however; they are also used by insurgents.Most countries have controls in place that regulate production, sales, and possession of firearms and ammunition (see gun politics for regional information).Other uses for improvised firearms include self-defense in lawless areas, or in poor rural areas for hunting game for food or profit.They range in quality from crude weapons that are as much a danger to the user as the target, to high quality arms produced by cottage industries using salvaged and repurposed materials.This means improvised firearms are for the most part illegally produced, which makes their possession and use criminal as well.While inexpensive 3D printers currently can only produce poor quality weapons, and industrial 3D printers are impractically expensive for most users (and still produce inferior weapons due to material limitations), there is concern that 3D printed firearms may result in proliferation of untraceable firearms in the future, as 3D printing technology improves