The problem with putting an external compensator on any autoloader is that had to be indexed. You wouldn't want the port facing anywhere but up. Thread locker won't work because the compensator has to be removed to get the barrel out of the slide. The customary method to index a compensator is to use a grub (set) screw. Screwing a grub screw into a compensator and against the threaded barrel will bugger up the threads on the barrel, making the compensator difficult to remove. The best method is to mill a flat spot or dimple on the barrel for the grub screw to land on without buggering up the threads.
Suppressors don't have this issue because they don't need indexing. The one compensator Silencerco Osprey that does need indexing is indexed within the silencer independant of the threads.
Note: Regular thread locker, in this instance, won't work for 2 reasons, one mentioned above and second because regular thread locker is affected by heat. After a few shots, the thread locker will become liquid again leaving the compensator to miss-index at will. There is a specialty thread locker sold by silencershop that is not affected by heat. Water is the solvent used to deactivate it.
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