Handguns which fire blanks are being converted into deadly weapons by criminals. File on 4 has discovered they're now being used more often than real handguns. Adrian Goldberg meets victims of gun crime and explores the UK's trade in illegal firearms. He discovers how easy it is to buy a blank firing pistol which can be illegally converted into a lethal weapon in 20 minutes, and hears from a former gangster who warns the law has too many loopholes. The UK has some of the strictest firearm laws in the world. So as some criminals struggle to obtain genuine guns, they're now getting blank-firing weapons converted into deadly weapons. As reporter Adrian Goldberg discovers how easy it is, gun campaigners call for tighter regulations around the manufacture and sale of blank firing weapons. Reporter: Adrian Goldberg Producer: Paul Grant Journalism Assistant: Tim Fernley Editor: Carl Johnston