Im about to do a new build and people have been talking about 620 as a more appropriate bedding medium for the barrel extension than blue. I've done it in blue and red and with a little heat and a wooden dowel rod the barrel can be removed....

Is servicing a receiver with 620 any more difficult?..its a lot thicker and easier to work with.....

Anyone?

Used it but haven't tried disassembling one with it yet.  It's made for cylindrical surfaces gaps.

Seems to me it would be a pain in the a$$ to remove if needed.

"Loctite® 620™ is a high temperature (450°F), high viscosity liquid retaining compound for cylindrical bonding .Provides a shear strength of over 3,800 psi on steel. Locks and secures metal cylindrical assemblies up to 0.015" diametral clearance. Prevents metal fretting and corrosion, Stops leakages. Typical applications
include locating pins in radiator assemblies, sleeves into pump housings and bearings in auto transmissions."

It would probably come off with a blow torch or a big cut off blade on a hand grinder. Sounds like overkill. I just use anti-seize compound.