I've heard some more info about these. Apparently the power source is 75 gram CO2 but Tanio Koba is only getting around 200 shots per tank. Shoei gets 800 shots on the same tank in their GBB MG42. The recoil on Escort-powered guns is also considerably higher.
Nevertheless it's a VERY nice development for internally-powered gas blowbacks! Wonder what they'll cost and if they'll be regular production items.
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