Bump stock
The legality of bump stocks in the United States came under question following the 2017 Las Vegas shooting , which left 60 civilians dead and an additional 867 injured; the gunman was found to have equipped them to his weapons . 
<triplet> 2017 Las Vegas shooting <subj> 60 <obj> number of deaths <subj> the gunman <obj> perpetrator <triplet> the gunman <subj> 2017 Las Vegas shooting <obj> participant in