Gun makers defended their product on Wednesday during a tense House hearing on mass shootings, saying 'murders are responsible' for the deaths. Democrats revealed American gun manufacturers earned more than $1 billion from the sale of AR-15-style semiautomatic weapons over the last decade, as lawmakers grilled gun makers after a recent series of mass shootings led to multiple deaths in Uvalde, Texas; Buffalo, New York; and Highland Park, Ill. Marty Daniel, chief executive officer of Daniel Defense - which made the gun used by the shooter to kill 19 school children and two teachers in Uvalde, Texas - defended his...