Out of curiosity I examined the firing pins of my 2 last night.
Under an 8x Loupe both had crud on the surface engaged by the sear.
Crud being microscopic bits of either metal or powder stuck to the surface with oil.
Actually looked more like fine metal filings (not me) than powder
A toothbrush and cleaning patch.
Unfortunately I am in a lockdown State and cannot field test the result at this time
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