After seeing the amount of crud built up, even brass shavings in firing pin channels over the years I will not use oil/grease on a firing pin or striker. If I feel I must have some lubrication, I use Sentry Solutions dry lube,
When you clean your AR, how black is the oil on the firing pin? After just 50 rounds it is nasty. After 250 rounds, it will get very gummy. Not good for reliability
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball