I'd ordered some short vietnam style ones that were also A&K, but managed to cancel it before dispatch when I found the large ones wouldn't fit properly. At an airsoft shop yesterday, the tech guy did mention that G&Gs were often fussy and rarely worked with A&K mags without modification. He recommended Nuprol mags, but they don't do the short mags. G&G on the other hand do (although they're nearly 3 times the price).
I may give those ASG's a try then. But jesus, I don't need 10 of the damn things! Anyone fancy going halves? £30 for 5 mags?