it CAN have the effect of slowing down your BB's, and i've noticed the effect (especially on my pistol).
Instead of the air coming out of the barrel being able to disperse in all directions, it's able to expand only slightly, and into the marginally larger diameter of the silencer. Granted, the foam or baffles "absorb" some of it, the BB's still pushing through what is effectively "denser" air.
It's a minimal effect, but it exists.
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