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Legacy:RParticles/WeaponEmitter
From Unreal Wiki, The Unreal Engine Documentation Site
This class is part of RParticles by Raven
Emitter which can be spawned/destroyed during game (mainly for weapon effects). It should be destroyed either by calling EmitterDestroy() or by GoToState('BeforeDie');. You shouldn't use Destroy() function, because it'll cause accessed none error by spawned particles.