You should download the manual of P.A Luty. He shows how easy it is to build a full auto submachine gun. He did it to make a point when Guns were banned in the UK. He was arrested in possession of these home made firearms. Sadly, Mr Luty passed away a few years ago from Cancer just before his case was going to trial. His manual, "Expedient Homemade Firearms" is widely available for download.
