
The M4 cluster adapter is a component of the M12 NP incendiary bomb cluster. The adapter is approximately 39 11/16 inches long, 8 3/4 inches wide, and 10 1/16 inches high. It consists of a suspension-bar assembly, a bar, and two end plates.
No information about hazardous components.
Nothing else to see.
TM 3-400, Chemical Bombs and Clusters (1957)