Do NOT recommend Promags
I have been involved in shooting sports approx 40 years, over 10 years as a firearms instructor. Have purchased several Promags and found them to be of poor design, substandard material and poorly fabricated. I would now not even insert them into a quality pistol like a P99.
On the other hand, the original Walther mags made by MecGars are some of the best mags in the world, with those available, no reason to even consider stuffing a substandard product into the mag well of such a fine firearm. I stay away from Promags and I also stay away from any firearms dealer that sells them, as I believe it does not speak well for a dealer.