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The Vltor Freedom Rail will fit Milspec AR15 upper receivers. It includes the barrel nut and mounting hardware required to install.
The interior diameter is 1.38".
VLTOR says
The Freedom Rail provides a strong and rigid forend that is easy to install with the provided hardware and barrel nut. No clocking needed to align barrel nut and gas tube.
You can download the installation manual at
https://www.vltor.com/wp-content/uploads/2016/01/Freedom-Rail.pdf
Mark H.