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If you are building an Aero M5 upper, this handgaurd lines up perfectly with the top rail. The attachment system locks up tight and don’t see any reason for this rail to move. If you are using an SLR adjustable gas block, don’t tighten it down until after you have made your adjustments. You won’t be able to get to the adjustment screw with the rail installed, and the nuts are hard to get out once you torque it down.
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