None of my three rifles line up. All are BCMs. One Centurion CMR, one MI gen 3 SSM, and one BCM KMR-A. I think they line up initially, but when you tighten the screws it flexes the handguard and causes the receiver rail to lower. Because the KMR-A is tightened at the top, the effect is lessened and it's nearly level, but it's still slightly lower.
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