It's likely indigenous. After the Shah fiasco in 1979, the US and many in the West cut most business ties with Iran. Having a western product show up in a public picture 40 years after an embargo would likely turn the heat up on their suppliers.
The Persians are smart enough to try avoiding that situation. They are very clever and industrious people, and there's no reason they couldn't copy a Colt or even a Kimber 1911 with very high fidelity, and very low cost.
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Cave illos in guns et backhoes
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