well sometimes the tip has a screw in it that stops it from roatating, look the whole flashhider over and see if theres anything that looks like a allen key might fit into, if there is grab a key and remove the little screw this should make it easier to remove.
or
your gun is a Classic army right?
apparently they use a rediculous glue on them.
boil water and dunk the tip in.
then un screw
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as for installing the new metal flash hider its as easy as screwing it into place and then if theres one of those screws tightening that
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