Two Alabama men, both convicted felons, were indicted Thursday on federal charges of illegally possessing firearms.

Arthur McCall Jr., 42, and Terry Roy Williams, 45, were indicted late Thursday, Acting U.S. Attorney Robert O. Posey and federal Bureau of Alcohol, Tobacco, Firearms and Explosives Special Agent in Charge Steven L. Gerido announced. The two indictments were separate and from unrelated incidents.

According to McCall's one-count indictment, he was found with a Smith & Wesson 9mm semi-automatic pistol in June 2016 in Jefferson County. McCall, of Birmingham, has felony convictions dating back from 1996 to most recently as 2011. According to the indictment, he has several convictions of drug possession, second-degree assault, and third-degree robbery.

Williams, of Jackson County, had a two-count indictment. The first count charged him with having a destructive device- similar to an explosive grenade- in July 2016. The second count in Williams' indictment charges him with possessing a destructive device that he did not register with the National Firearms Registration and Transfer Record. According to the indictment, the device should have been registered because it shot a projectile by explosive discharge and had a barrel with a bore greater than one-half inch in diameter.

His prior felony convictions date from 1994-2002 for bank robbery, third-degree burglary, second-degree property theft, first-degree property theft, and drug possession, the indictment shows.

The maximum penalty for being a convicted felon in possession of a firearm is 10 years in prison and a $250,000 fine. The maximum penalty for possessing an unregistered firearm is 10 years in prison and a $10,000 fine.

ATF investigated both cases, and the U.S. Attorney's Office for the Northern District of Alabama is prosecuting.