I just finished the P7PSP. It was challenging to put it back together since I took every part and spring off. Not sure I recommend trying that unless you have another one to look at.
It was blued and rusty had tool marks. I ground off the toolmarks (that were on the sides of the trigger guard) and did it with GunKote.
www.silencertests.com
It was blued and rusty had tool marks. I ground off the toolmarks (that were on the sides of the trigger guard) and did it with GunKote.

www.silencertests.com