Golf club heads with stiffening ribs

A golf club head comprising:

• a first component adhered to a second component to define a closed interior volume therebetween, a strikeface configured to strike a golf ball, a rear portion opposite the strikeface, a crown, a sole opposite the crown, a heel, and a toe opposite the heel;
• the first component comprising a crown return extending rearwardly from the strikeface, and forming a portion of the crown, a sole return extending rearwardly form the strikeface and forming a first portion of the sole, a sole extension extending rearwardly from the sole return and forming a second portion of the sole, a back rail connected to the sole extension, and a crown bridge extending between the crown return and the back rail;
• the back rail comprising a top wall, a rear wall, and a lip together defining a channel extending along the back rail in a heel to toe direction and configured to receive a weight portion of at least 14 grams;
• a rib located within the closed interior volume and extending between one or more combinations selected from the group consisting of:
• the crown bridge and the sole, the crown bridge and the rear wall, and the sole and the rear wall.