Perhaps you could print one? I know there's a guy on this forum who owns a 3d printer who may be able to do it for you but I forget their name. Is it you @Samurai?
Thanks @Gepard. I do have one I made for the odin adapter, but the different brand mp5 mags are so different that It worked fine with 2 or 3 types of mines but not with an other.
Evike has one that has a different locking mechanism, that might work with more brands.