Utah federal Judge Thomas Greene fined a Davis County man $500 Monday upon his guilty plea to allegations he illegally sold C-4 plastic explosives to an undercover informant.

Greene also placed David Lynn Stevenson, 41, Layton, on two years probation.Stevenson, a construction worker, was charged last year after federal prosecutors said he obtained the explosives from a Hill Air Force Base airman and sold them to the informant.