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Sounds like the issue I had trying to fit my CNC'd lower to my trigger pack on an AR-15 type GBBR. The pin was too long as the lower was extremely tight, and it was getting caught above the valve pin instead of behind it, even retracted. Essentially I would get vents, or light strikes. I had to solve it by slowly filing down the firing pin until it wouldn't bind on the valve pin, but behind it as it should.
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