03-01-2021, 05:12 PM
Several on this forum use Loctite for barrel bedding the barrel extension to the upper receiver after lapping the upper. I've used Blue Loctite to do so but I notice that others use Green Loctite (620). Since adhesion isn't the objective but filling the gap between the extension and upper is the objective, what advantage is there in using Green Loctite, if any? Green Loctite would make the barrel more difficult to remove because of its greater adhesion properties. I did read somewhere that Green Loctite (620) has greater expansion properties and presumably would be better at gap filling especially with cylindrical devices.