I managed to extract the gun audio from PUBG if you want to use that in this mod, especially because some of the sounds for the guns are waaay too loud compared to the vanilla guns.

I uploaded my own mod that just affects the vanilla guns and I have to say, some of PUBG's gun sounds fit surprisingly well in Insurgency. The suppressed mosin sounds frigging cool as well.

So far I've got the audio files for the:
AKM+suppressor
M16A4+suppressor
M416+suppressor
SCAR-L+suppressor
Groza+suppressor
AUG+suppressor
AWM+suppressor
M1897
Beretta 686
DP-28
M249
Mini-14+suppressor
FAL+suppressor
G18+suppressor
Beretta 92+suppressor
M1911+suppressor
R45
M24+suppressor
Kar98k+suppressor
Saiga-12+suppressor
Sawed off
QBZ-95+suppressor
SKS+suppressor
Thompson (have no clue at all wtf the suppressed sounds are)
UMP+suppressor
Vector+suppressor
Micro uzi+suppressor
VSS

Now the thing is there's no aussie servers that have this mod + a functional medic plugin so I forgot which guns are in it, give me a list and I can use audacity to put the audio together and send it to you somehow.