The internet videos are alarming to some, thrilling to others: Gun enthusiasts spraying bullets from AR-15-style rifles equipped with an after-market trigger allowing them to shoot seemingly as fast ...

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This undated photo provided by the Bureau of Alcohol, Tobacco, Firearms and Explosives, shows the FRT-15 made by Rare Breed Triggers, an after-market device for AR-15-style rifles that allows them to ...