It's a double fail because magazines are usually packed into pouches with the ammo facing downwards, as far as I know.
Though, it's not impossible that real steel M4 magazines might have a small hole similar to that drilled into the base plate. I don't know why they would, but they might.
two_zero, I can't see the picture that you linked initially, if I click it then it sends me to a massive page with a billion different photos on it. \