Russian Cluster Adapter, RBK-500 Old Style
These are air launched, high drag, freefall nose ejection clusters which employ a mechanical time tail fuze. The clusters may be loaded with fragmentation, antitank, incendiary, or toxic chemical bombs.
The clusters are painted olive drab (OD) or gray. Markings on the OD clusters are black. Markings on the gray clusters are black and white. The designation of the bombs contained in the cluster is stenciled on the front half of the cluster.
Nothing else to see.
Collaborative Ordnance Data Repository