A hollow golf club head comprising a first component and a second component. The first component comprises a crown return extending rearwardly from a strikeface and forming a portion of a crown; a sole return extending rearwardly from the strikeface and forming a portion of a sole; a sole extension extending rearwardly from the sole return; and a back rail connected to the sole sections. The back rail comprises a top wall, a rear wall, and a lip, which together define a channel extending along the back rail in a heel to toe direction. The second component comprises a heel side wing and a toe side wing that extend from the crown to the sole around a heel end of the club head. The channel is configured to receive a weight portion. The first component comprises a majority of the overall mass of the golf club head.