Indeed, Maple Leaf rubbers can be long lipped. You might get lucky, or not. My Specna Arms feeds fine off its own mags with its own hop unit and a Maple Leaf, but doesn't like any other mags - I've been meaning to give it a little trim.
I actually think it is more to do with the barrel more than anything. If I swapped to my default barrel it seems okay. I know people say that AK hopups are more of a pain.
I'll second the above advice. I think that the 16 is a good rif to start tinkering with. It's so easy to break down that feeding issues are soon fixed.
