GO TO
mods\x64\audio\sfx\RESIDENT.rpf

right click on "weapons.awc" and select "export to open formats"
then export to desktop

now drag and drop my file into the weapons folder on you're desktop
replace files in destination

then go to
mods\x64\audio\sfx\RESIDENT.rpf

click "new" on you're upper lefthand corner and select "import open formats"
Now select the weapons.oac and import

RUN THE GAME AND ENJOY!