Currently on display at London’s Excel Conference and Exhibition Centre are more ways to kill people than you can imagine: tactical sniper rifles from the United Arab Emirates’ Tawazun Advanced Defense Systems, medium-calibre mortars from India’s Ordnance Factories Board, optical sights for grenade launchers from Bulgaria’s Opticoelectron Group. And there’s the less lethal, too, like the CS gas made by NonLethal Technologies of Pennsylvania. 'Sure it’ll make you tear up,' a company representative said. 'But it won’t kill you.' He might have added: 'usually'.