I took a Colt 6920 and swapped barrels and uppers with the nsr rail on each. The rail was perfectly centered on the bcm upper with the colt barrel installed. It was off center with the bcm barrel on the colt upper. This narrows it down to the barrel/extension.
BCM asked me to return the whole upper. They've been awesome with communication about this. Any company can and does produce a lemon here and there, it's how they deal with it that counts.



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