Federal authorities have arrested two Missouri men accused of stealing 19 firearms — including five rifles — from a gun store in southeast Colorado last month before selling most of them in St. Louis.

Calvin Terrell Stafford and Napoleon Williams, both 23, were ordered held without bail by a federal judge Friday, Colorado’s U.S. attorney’s office said.

Prosecutors allege that on Aug. 10 the pair traveled to Springfield, Colo., intending to buy marijuana to sell in Missouri.

“When the marijuana deal fell, through, they decided to steal firearms from a local gun shop,” the U.S. attorney’s office said. “They stole 19 guns, including five rifles, from Best Way Sales in Springfield. After the burglary, the defendants drove the stolen firearms out of Colorado to St. Louis … where they sold most of the stolen guns.”

Stafford and Williams face a sentence in federal prison — and thousands of dollars in fines — if convicted.

The Bureau of Alcohol Tobacco Firearms and Explosives worked with the Baca County Sheriff’s Office and Springfield Police Department on the case.