Even as the full extent of last week’s horrific Las Vegas mass shooting was yet to become clear, share prices in America’s largest listed gun manufacturers were already shifting higher in pre-market trading. Mass shootings such as this – an all too familiar tale in the US – often result in the strange quirk of prompting shares in gun makers to rise, as the prospect of tighter gun controls in the country triggers increased demand. Shares in Sturm Ruger and American Outdoor Brands (the owner of Smith & Wesson) were both up by around 7% at one stage, before retreating slightly.