I ended up clear US Machine Gun out of their stock of M10 single feed mags. Hopefully one of them will work.
I haven't shot those mags in a while, but if I remember correctly they'd usually get hung up on the feed ramp.
"Our contract called for 16 cases of rifles and ammunition for $10,000 dollars, not a machine gun...........That is our present to the General"-Pike Bishop
“When fascism comes to America, it will be wrapped in the flag and carrying a cross.”