The bezel ring of the MH20 is like some Surefire bezels, they are not designed to be removed but my friend removed the bezel of his Surefire G2X Pro using a industrial heat gun (not his wife's hair dryer) You can do the same with the MH20 by using a heat gun with a narrow nozzle to concentrate the heat just on the ring and then followed by a strap wrench. Need to understand that you need to get the ring hot, not just warm, and there's a 50-50 chance that the lens will crack which might result in more $$ - After looking at my MH20, I don't know for certain if there are threads, however if there are, they are purposely glued with an strong adhesive but I'm sure the ring it's removable otherwise how will Nitecore change the lens if it get cracked or broken?...But if you remove it your self most likely result in void of the warranty. You should ask Nitecore for more details, you can email the factory at
[email protected]. I'm sure they will not tell you how to do it but I guarantee they will ask you why you why you want to remove it, just tell them you desperately in need of a GITD o-ring..