Not sure what you're asking. I've owned a few P7s.
AFAIK, there are no aftermarket mags for them, and the stock ones ain't cheap. They are super guns, collectible, great shooters, nothing bad about them other than the price. I believe there will be a flood of German police turn-ins coming to the US in a year or two. There are 30,000 of them coming out of service there, but there's a debate over whether to destroy them or export to the US. The last one I got was $500 around 2006. They're $1500 now.