I know on my King Arms M4 there was a set screw in the flash hider. It was filled in with glue however and I had to get that out first (I used the tip of a knife.) It was also glued to the threads which are 14mm CCW, same as a Toyko Marui and most other clones. In my case I just used force but something such as a heat gun may help. Just remember if you do use pure force to wear eye protection as there is a chance for the plastic to fragment. Don't worry too much about hurting the outer barrel either as long as you are sure there is no set screw.
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