I was planning on using MolyDi grease.
Rifle will have a 20" government profile barrel, flat top upper, and Cavalry Arms MKII lower.
I think Martin using Loctite is more for Match type rifles where security and no movement is a concern. I recall seeing elsewhere where some shooters replace the upper and barrel together, maybe due to Loctite?
Have been to ar15.com and read some debates about barrel torque.
I plan on screwing the nut by hand, then line up the hole using a wrench. Done this once before with good results, and seems to be the preferred method at ar15.com and with some other names in the business. I won't use the triple torque method.