At least some of them also use 106mm recoilless.
The choke point on them, as far as a scavenger sort of economy, is that I think the US government support for those programs doles out ammunition in ones and twos (or whatever) as needed. Someone in the government having made the occasional bright idea that handing out a 90mm or 106mm recoilless rifle and several pallets worth of ammunition in one go has a some very, very bad potential worst case outcomes.
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