suppresor and silencer are same words in polish translation

[Typowy Mickey]

I think that uciszacz would work best for silencer

 

[Sir_Patyna]

I would also change the suppresor, cuz "tłumik" is too associated with a muzzle device

 

[kotkowski]

"Silencer" could be changed into "Wyciszenie", which directly would mean "Silence", and would also work, as it applied "Silenced"

 

[Dashiell]

Suppressor should be "Stłumiacz" because it's supposed to be an item not concept and it's context is that it suppresses enemy's fire rate. "Tłumik" would be only correct as muzzle silencer as Sir_Patyna has said.

Silencer should be "Uciszacz" because it's an item and we're silencing them.