Looks like it was unburned powder after all... From the Atlanta Journal-Constitution (
http://www.ajc.com/metro/content/metro/cobb/0703/15explosion.html), July 15:
Workplace blast burns three seriously
Incident occurs at gun maker's test-firing range
By DON PLUMMER
The Atlanta Journal-Constitution
Three employees were burned seriously Monday morning in an explosion at a Smyrna gun manufacturer.
The blast, inside the test-firing range at the headquarters of Glock Inc. at 6000 Highlands Parkway, resulted in "very serious" life-threatening injuries to the hands, face and arms of a male employee, said Smyrna Police Chief Larry Williams. Two other employees, a male and a female, sustained "serious but not life-threatening" injuries, Williams said.
"It doesn't appear that the explosion was from a weapon," he said. "At this time, it appears the explosion was residue from spent ammunition." The cause of the blast will be investigated by the Occupational Safety and Health Administration and the Bureau of Alcohol, Tobacco and Firearms, Williams said.
The injured employees were taken to the burn unit at Grady Memorial Hospital, the most seriously injured man by helicopter. Authorities would not release their identities.
Two remained hospitalized today, while the third was treated and released, said Grady spokeswoman Frankie Smith.
The most seriously injured man was in critical condition today, and the woman was in stable condition, Smith said.
"There was a blast-fire type of explosion that burned the employees," Williams said. However, sprinklers were activated by the blast and there was no fire when firefighters arrived, Williams said. "If there was any fire it was controlled by the automatic suppression equipment."
Damage was confined to a room where employees test guns manufactured at the company, Williams said.
Glock issued a statement Monday through emergency officials saying the company would have no comment until today.
Calls to Glock on Monday afternoon were answered by a recording saying the company's offices were closed. Calls to OSHA were not immediately returned.
Glock was founded in 1963 In Austria. Its U.S. and Canadian headquarters in Smyrna opened in 1985. Glock pistols are used by 65 percent of U.S. law enforcement agencies, according to the company's Web site.
The company manufacturers 37 types of pistols as well as field knives, shovels and shooting apparel.