When bedding barrel with loctite does the loctite serve as grease? And should I use loctite and shims for a BCM thermal fit upper or one or the other?

[URGILOVERR]

Should I apply aeroshell then loctite when bedding the barrel or just loctite? And what loctite is the standard here for bedding an ar15 barrel into the receiver?

 

[Sogan]

Loctite 620 to the barrel extension and aeroshell on the upper threads where the barrel nut goes

 

[jb0311]

You shouldn’t need to shim or bed a thermal fit upper. I only bed it with loctite if it isn’t a thermal fit.