UPDATE! Now the mod has different sounds for every rate of fire, let me know if you like it! I'm looking for someone who can create a video with comparison with vanilla and mod sounds, any help would be very appreciated.
Finally!
After months of failures,I've finally learned how to make sound mods for automatic weapons, this will be the first of many, of course the first automatic weapon sound modified is the classic vanilla Assault rifle, but the mod will affect all the weapons that use it's default sound (even the weapon mods). Enjoy it!