I think it would be much easier, mechanically, to use a rimmed round, .380 or .303, rather than a rimless, 9mm, one and possibly easier to source as, if I remember correctly, the only British weapon at that time to use a 9mm round was the Sten/Sterling. The European farmers etc. would have used a more eclectic range of calibres but I would think 9mm would still be less evident than some others. In the end the insurgents would have used whatever they could get a hold of.
Regards,
Norman.
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