They have converted 9mm Largo Spanish Destroyers.Prone to extractor breakage. Except no two take the same parts as mostly hand fitted from small makers all over the country .........Basques if I recall correctly?
I've heard the destroyer carbine isn't strong enough for 7.62x25. It was told to me by someone on here who had done a few destroyer carbine conversions and he didn't know until after the fact.