I've used Dri-slide for over 50 years. It is my go to lubricant for ARs for over 50 years. I use it to lube the innards of revolvers. I will use it on stainless semi-autos. Generally I use the old Breakfree with PTFE on most guns. DriSilde doesn't have a "P" purpose. Old Breakfree has worked great for me for about 30 years. I don't use it for "C".Dri-slide
I agree Dri-Slide is the best lubricant out there.