Some silencers fit right over the flash hider, others require you to remove the flash hider, and screw it directly onto the barrel.
If what you ordered is the type that screws directly onto the barrel and the threads are opposites, you won't be able to attach the silencer on it's own; you'll need an adaptor of some sort (CW-to-CCW or vice-versa).
If it's the type that fits right over the flash hider, I dunno.
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