The metal tube forearm on the LR-308 has a seam and appears to be a two piece unit. Does the main part just unscrew from the barrel nut part? This would make since as teh sling/bipod stud is shipped loose and the owner is expected to install it. I'm I correct in that all I need os a strap wrench to remove the main part while leaving the barrel nut in place? I don't want to F-up the gas tube on my new gun!