If you narrowed it down to the BCG then you need to get it closer. I would look at the firing pin (firing pin protrusion) and the bolt.
It is also possible that the carrier itself is out of spec. I would replace one piece at a time in the new carrier and narrow it down further.


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those questions are relevant. What make is the carrier? Knowing the brand could help finding your issue. You never asked the make of your BCG? Take IGs advice






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