Remove the Spring clip, Firing pin, extractor, and guide. Clean the bolt head and parts really well. Inspect the slot that the firing pin sits in and the pin itself for burrs or anything out of the ordinary. Polish any questionable spots, reassemble and symptom will probably go away. I have not had one with the issue but have a friend that did this and his will misfire maybe 1 out of a hundred now. Hope you find the issue.
Good Luck,
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