Many years ago I found a .357 sig barrel for my 944, through EFK Firedragon. Mine was the link design and Firedragon was the only supplier. I mention this because in my search for that barrel, no one made a replacement barrel for the cam-bloc design. You may have to go special made. I also don't recall anyone advertising custom work for the P series. Maybe a call to Firedragon or KKM could be of better help. Good luck.