https://www.m4carbine.net/showthread...rease-accuracy
Basically used to "bed" the barrel extension in the upper. Does not "glue" it in, just like bedding does not glue in the action in a bolt action rifle.
In the link Rob Jennsen among others mention using this method in an accuracy build, unlike the situation presented by the OP.
Only mentioned it because he described significant movement of the barrel extension in the upper prior to tightening barrel nut. This method just might help avoid the need to buy another upper, if it works.
Not much to lose, maybe $10-15 on Amazon.


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