A pair of Harrisonville residents were arrested Monday afternoon in Cass County.  According to the Highway Patrol report, Kenion R. Brown, 35, was charged with felony methaphetamine possession, possession of drug paraphernalia, expired registration, and no seat belt.   Christopher D. Moore, 25, was charged with felony unlawful use of a firearm.  Both were held in a Cass County jail and later released.