Convert an MP3 to WAV and name it "g3sg1-1" then override it with the original file which is located here.
"D:\Steam\steamapps\common\GarrysMod\garrysmod\addons\m9k_heavy_weapons_128091208\sound\weapons\psg1"

Convert an MP3 to WAV and name it "g3sg1-1" then override it with the original file which is located here. "D:\Steam\steamapps\common\GarrysMod\garrysmod\addons\m9k_heavy_weapons_128091208\sound\weapons\psg1"