Some models have their flashhiders glued on (i.e. epoxy/superglue)...or loctite'd on. Either way, usually hitting it with a propane torch will vaporize/soften the glue enough so that you can wrench it off.
Most flashhiders have flats where you're supposed to use a wrench....
And you've got to hold the outer barrel too (better than holding the receiver...for AS)...if you need additional grip, sometimes a bit of rubber sheet will provide enough grip for your vise/pliers while still protecting your barrel.
If the flashhider is truely mangled...then have at it I suppose.
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