Man, I finally found the info on a German forum.
I had known the P2 A1 to be a flare gun, but...
P1, postwar alloy frame version for military and police of P38
P2 SIG P210, it was used in the BGS
P3 Astra600 (from some leftover wartime contract)
P4 a shortened version of P1
P5, Walther P5
P6 SIG Sauer P225
P7 H&K PSP/P7
P8 USP version in the military(see trough greenish plastic mag)
P9 could be the old H&K P9S, it was used by the GSG9, but not sure, as they also used S&W 38 snubbies in the hostage rescue at Mogadishu and did not number their guns, since they had so many ( edited it's the Glock 17)
P10 H&K P2000
Now, the P11 is, I believe the elecrtronically controlled "pepperbox-style" underwater pistol of the Kampfschwimmer
and the P12 is the H&K Tactical, used by the German SOCOM