If you mean the plastic 6mm "BB"s then that is what the WE airsoft Lugers shoot.
If there are any Luger copies that fire metal BBs, I don't know of them.
As of holsters that have shrunk too far to close around the gun, maybe just stuffing them carefully with clean cotton rags would hold them from collapsing further, since you would not be keeping them as functional vintage holsters, but for their historical value alone.
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