James Holmes is responsible for one of the largest mass shootings of its kind in US history – but it did not result in the largest number of deaths. ... The police said he appeared to have legally purchased all of the weapons, including a second pistol found in Holmes's car. ... Shotguns and handguns have always been readily available in Colorado, but until eight years ago Holmes would not have been able to buy the AR-15 semi-automatic assault rifle he was carrying quite so easily. The manufacture and import of AR-15s and similar weapons, such as AK-47s, were banned...