A slotted M-track or building wall support structure generally characterized by a metal M-shaped channel beam member is disclosed. The M-shaped channel beam member is defined by a pair of elongated confronting sidewalls integrally connected to an open end of an elongated and generally V-shaped stud receiving track. The V-shaped stud receiving track is positioned between the pair of confronting sidewalls and a pair of elongated and spaced apart coplanar legs. The legs are perpendicularly connected to the sidewalls and to the open end of the generally V-shaped stud receiving track. The V-shaped stud receiving track includes a plurality of longitudinally spaced slots, with each slot sized and configured to receive a stud.