I don't have specifics, but all goverments issue specs for a product they desire and any suppliers who can meet those specs within the bid parameters will usually get the job.
In wartime, the usual suppliers are augmented by non traditional shops in related fields, (for holsters, this would be saddle and harness shops, bootmakers, etc.)
This is why we have M1 Carbines marked General Motors, Rockola, etc.
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