Ben Turnbull has transformed school desks and church materials with chilling effect.
According to a fundraiser for Jemil Evans, his friend had just received his license to carry and was excited to show him his new gun.
At least 1,900 U.S. military firearms were lost or stolen during the 2010s, with some resurfacing in violent crimes, an investigation has found.
Douglas John Kantor, 25, died from his injures following the Saturday shooting that left more than a dozen injured.
Mass shootings in Austin, Chicago and Savannah, Georgia left two people dead and 30 others wounded.
California's governor said Judge Roger Benitez, who recently overturned the state's assault weapons ban, "writes press releases on behalf of" the gun industry.
"Common sense tells us" that the new gun measure is "ridiculous," said Art Acevedo, the former Houston police chief.
"We can, and we must, do more," the president said of America's gun violence epidemic.
At least one person appears to have suffered a gunshot wound, police said.
This year is shaping up to be a particularly violent one in terms of mass shootings, according to records kept by the Gun Violence Archive.