US Cluster, 100 lb Frag, AN-M1A4
The 100 pound frag bomb cluster AN-M1A4 consists of six 20 pound frag bombs assembled in cluster adapter AN-M1A4. Cluster adapter AN-M1A4, like cluster adapter AN-M1A3, is a mechanical release type adapter which holds the bombs in two banks of three bombs each and releases them upon withdrawal of the arming wires. Cluster adapter AN-M1A4 is identical to cluster adapter AN-M1A3 in all respects but the following: cluster adapter AN-M1A4 has two suspension lugs, the middle suspension lug has been removed, while cluster adapter AN-M1A3 has three suspension lugs.
The difference between frag bomb cluster AN-M1A3 uses cluster bomb cluster AN-M1A4 and frag bomb cluster adapter AN-M1A3, while frag bomb cluster AN-M1A3 lies in the cluster adapters used. AN-M1A4 uses adapter cluster AN-M1A4.