I Suck at tutorials but im gonna give it a try! 

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IN RESIDENT.RPF YOU'LL SEE weapons.awc FILE

RIGHT CLICK ON weapons.awc AND CHOOSE Export to openformats !


EXPORT IT TO WHERE EVER YOU WANT (i choose desktop mostly)

NOW GO TO PLACE WHERE YOU EXPORTED IT AND YOU'LL SEE TWO NEW FILES 
1.WEAPONS FOLDER
2.WEAPONS.OAC


ONLY THING YOU HAVE TO DO NOW IS TO EXPORT THE AUDIO FILE PROVIDED IN THE MOD TO WEAPONS FOLDER

CLICK OKAY WHEN ASKED TO REPLACE EXISTING FILE !


AFTER ITS REPLACING IS DONE, GO BACK TO OPENIV AND CLICK ON "NEW" BUTTON LOCATED IN UPPER LEFT OF THE PROGRAM

AFTER CLICKING ON NEW, SELECT IMPORT OPENFORMATS !

NOW NAVIGATE TO WHERE THE MODIFIED WEAPONS FOLDER IS AND ONLY IMPORT THE WEAPONS.OAC ! DONT IMPORT THE FOLDER !  

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Enjoy and wait for mod updates to fix existing bug with MICRO SMG 