What seems to be the issue here is that the first round will load fine but the second round wants to launch it's self into the chamber as well causing a double feed. Gun works fine with 30 and 40 rounders. I find the whole thing rather odd, I have a converted Saiga that the mags run fine in.
I'm rather perplexed about the whole thing with frustrates me which makes me say mean things about the mags on the internet. I hate not being able to fix some thing.