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I actually had the same problem recently with a BCM 20" upper. The rifle was consistently shooting right, to make sure it wasnt just me I picked up a laser bore sighter and it took 16 clicks to the left on my Troy Rear folding sight to get the front sight post and laser bore sighter properly ligned up. Contacted BCM and they said thats in spec when in use with a folding sight, and the only way to properly check would be by installing a carry handle sight. I pulled my Daniel Defense fixed rear sight from my other BCM upper and popped in the bore sighter and sure enough the laser was still printing right. Ended up selling the upper to a buddy for a loss who was aware of the problem. Ordering a 16" BCM upper to replace it soon, well see if this one shoots straight.
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