The design is famous because it requires no purpose-made gun parts. It uses steel tubing, bar stock, and nuts/bolts available at any DIY shop.
This phrase is synonymous with the work of , a British author and gun rights activist famous for his manual Expedient Homemade Firearms: The 9mm Submachine Gun .
Manufacturing firearms without the proper licensing is illegal in most jurisdictions. These plans are generally studied today for their historical, political, and engineering significance rather than for practical use.
Discussion on the "un-stoppable" nature of information and DIY manufacturing.