=== Homemade or improvised firearms ===[[File:Bosniac shotgun.jpg|thumb|right|A crude but effective improvised 12-gauge shotgun used during the [[Bosnian War]]]]
The (Lightning) was a simple [[submachine gun]] produced by the [[Armia Krajowa]], or Home Army, a Polish [[resistance movement]] fighting the [[Germany|Germans]] in [[...|occupied Poland]]. It was produced in underground workshops. Its main feature was its simplicity, so that the weapon could be made even in small workshops, by inexperienced engineers. It used threaded pipes for simplicity.