This will be the reason to buy a 5.7X28 PDW. The problem with pistol mag angling to the body vs straight mag in SMG is that the stock will make it difficult for anything but big hand to shift for the finger to hit the pistol style mag buttom. The stock will be on the inside of the arm and won't allow the hand to shift the grip to point the weapon in for the thumb to hit the button. That's why mag in the grip SMG like HK MP7 and UZI don't use pistol style mag button. MP9 has a thumb mag button because the original Steyr TMP was intended to use without a stock.
Unfortunately this will be something to live with. Or they can use a HK style paddle.
Unfortunately this will be something to live with. Or they can use a HK style paddle.