Put in "assets/mod_overrides". If there's no "mod_overrides" folder just make one

Currently replaces:
Thompson M1A1
BAR Heavy Rifle
M1 Garand
M1 Carbine
M12 Shotgun
Double-Barrel Shotgun
MP 38
Sterling Machine Carbine
Colt M1911
Degtyaryov DP-28
Springfield M1903 Rifle
StG 44
Mosin Nagant
Karabiner 98k
M24 Stielhandgranate
Bren
Flamethrower
Lee Enfield
C96 Mauser
MG 42
Sawn-off Shotgun

Preview the sounds here:

Not my video, hope that doesnt matter