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this gun is a series 80 with the firing pin block safety for a true mil-spec gun it would need to be a 45 acp as there are no Mil specs for a 9mm 19111 it does not get any more Mill spec that this colt series 70 45 acp it even has the mil spec sights https://www.budsgunshop.com/catalog/product_info.php/products_id/415007813/colt+1911c+govt+45acp+5+b

Steven, this is a 80 series pistol and the 9mm is modeled the same as the Mil-Spec'd 45 version : https://www.auto-ordnance.com/auto-ordnance-1911-pistol/