I recently picked up a GEM-TECH TREK moderator and found in the manual the recommendation to attach it to the barrel with blue Loc-Tite. I thought this a little odd with some people experiencing rust problems when they did not remove the can after shooting. I called GEM-TECH and spoke to a technician there who told me that they recommend using a bore snake after shooting. He told me he puts a small amount of bore solvent on the snake just in front of the brush and leaves an area dry after the brush. He then puts a small amount of lubricant on the snake behind the dry area leaving another dry area behind that to soak up excess lubricant. In my climate I rarely put lubricant in a barrel unless I am putting the gun away for a period of time so I will probably give this a try but omit the lube.
As to loc-titing. He recommended putting a small amount of blue loc-tite on the barrel threads and then screwing the mod on, remove, screw back on etc for several repetitions and then removing the mod from the barrel and allow the loc-tite to dry on both pieces with them separated. This creates a sort of "sticky-friction" that helps to prevent the mod from loosening.