Best handguard out there - JP Enterprises Modular Hand Guard D-Series for DPMS LR-308/Knights SR-25

Follow the Manufacturer's Instructions. The aluminum Outer Receiver Nut becomes an extension of the actual receiver, meaning the barrel nut threads into It, not the actual receiver, securing the barrel. Have seen videos and tried getting by with just anti-seize but after several hundred .308 rounds the assembly did rotate and bind against the gas tube. To prevent this, use Red threadlocker and a gas tube alignment tool when mounting the outer nut. No problems.
Handguard looks great, no integrated 12 o'clock rail and the factory texturing provides a secure grip under most conditions.