A universal firearm-mounted receiving apparatus adapted to receive an ejected casing from a firearm. The apparatus has an arm with a mounting piece disposed at one end and a receptacle for shell casings disposed at the other end (opposite to) mounting piece. The arm further contains one or more hinges that allow(s) at least a portion of the arm to move independently of another portion, thereby making the arm and receptacle positionable for a variety of different firearms.