I have heard of it being done but never witnessed it.The general concensus that I have gathered is dont use subsonic ammo in a fluted chamber.We have shot numerous rounds through a 33 with standard ammo using a Gemtech Halo with no problems.I just am not familiar with teh 308 yet.Although I do have a new 308 suppressor for bolt rifle action.This will be an interesting thread to watch.
I use a Gemtech HVT on my 91/G3. It works fine in semi or select fire. I don't use subsonic ammo with it.
I have the same issue as BIGDUKE60, I wish that the mount covered the flutes as well. It uses the bi-lock mount flash hider (Gemtech uses the same bilock mount for HK 91 and 93 series - inner diameter is same as the 91 flash hider).
Not the best picture (cropped from a larger picture), but you can get a sense of how the hider looks.
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