Hi, I have the JG G36 and have tried the Battleaxe adapter. It kinda works, but it is a bit iffy. I would actually specifically recommend against using the green box PMAGs, those are the ones that gave me the most trouble.
I tried it with a G&G hicap and it seemed to have less trouble, which suggests that perhaps it likes a slightly longer feeding tube and less of the "must be held pushed forward" bias that the greenbox PMAGs have.
I haven't done a comprehensive test... Maybe you could convince me to do it