Yes! you do need the standard barrel nut! Be sure to re-torque the barrel nut to a minimum of 35 Ft Lbs when installing it.
In all honesty your YHM Quadrail is much more sturdier! Only a thought!
The Constitution is not an instrument for the Government to restrain the people. It is an instrument for the people to restrain the Government!
America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves.