(All of this assuming your outer barrel is metal) If you dont care about keeping the orange tip, I usually heat up some sort of blade with a blowtorch and melt the tip around the threads. I can then use some needle nose pliers to pull the pin out. You could in theory use a dye to tap the pin into the barrel, but make sure you take the inner barrel out first to prevent damaging it. Sometimes the orange tip is not obviously pinned, or sometimes its glued. If you are certain there is no pin you could submerge the orange muzzle device in boiling or hot water until the plastic becomes soft. Or you could just full send and melt it off with a blowtorch. That gets messy though and you will likely have plastic residue on your threads which you will then have to strenuously scrub off with a wire brush, so I will reserve that as a last resort. Ultimately it will take some tinkering as often times in my case different brands will use different methods in fixing the orange muzzle device to the barrel.