Anyone have some opinions on my ar-15 light striking very often on my last range trip. It started off flawless ate up 100 rounds of m193 with no problems. Switched to a heavier match ammo, black hills 68gr and thats when it started. Thought maybe it was heavy primers so I switched back and it continued. I took care to clean the firing pin before my outing and not lube it. I am going to clean it again this afternoon and check if its full of crud.
Anything I might be missing?
Anything I might be missing?

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