Muffle yes, Silence, No. The bulk of the noise is from the gearbox, the only think you will muffle is the pop from the piston. I worked on a P90 that was pretty damn quiet to begin with after a good shim and lube job, pop the silencer on and it was night and day, very neat effect.
For the most part, they are used to hide a lengthened inner barrel.
Draw aggressively, shoot decisively, holster reluctantly.
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