They do have a proprietary barrel nut and I'll copy/paste the instructions here so you guys can see I'm not crazy
Installation procedure:
1. Lock the receiver in an action block or other suitable means. Be careful not to crush it.
2. Degrease the threaded area of the barrel collar and the interior threads of the larger aluminum
receiver nut. Some manufacturers use a Teflon coating on the receiver. Wr recommend that you
remove the coating from the threads with a stainless brushso that the Loc-Tit can bond.
3. Using the red 271 Loc-Tite, coat the threads of the receiver barrel collar and install the receiver
extension nut, turning it down until it stops. Then, back it off until the gas tube holes are in alignment.
Let that set for several hours hour until the Loc-Tit cures. It is important that the extension nut is solid
with the receiver or it will rotate when you tension the barrel collar against the flange of the barrel.
4. After the thread locker is set, slip the barrel extension piece into the receiver barrel collar. Make sure the extension piece pin is securely in the 12” locator notch in the receiver barrel collar. Apply a coating of anti-seize
compound onto the threads of the barrel retainer nut. Failing to do so may
cause the threads to gall and lock the two nuts together, ruining the aluminum
receiver extension nut. Slide the steel barrel lock nut over the barrel,
and turn it by hand until it stops against the extension piece flange. Then, using a standard armorers
wrench, apply 50 to 80 foot-pounds of torque as necessary to align the lock nut to the gas tube
channel.
5. Now, slide the tube over the barrel and onto the receiver extension nut. Index to the screw holes,
and install the seven 6x32 flat head screws to retain the tube.
6. Next, install the gas block/gas tube assembly and secure to the barrel by whatever method is necessary.
Finally, install the brake or flash suppressor if needed.



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