I just helped a friend of mine with this same issue. I have a PCR and he has a P-06. We took one of my CZ PCR mags without the rubber base plate and opened up the throat a little. (very little) Now he has a mag with out the big bulky base plate and it fits flush with the bottom of his gun and he is still holding 12 rounds. He went out to shoot it and it worked flawlessly for him.