NEED HELP WITH M16A1 SOUNDS

I noticed something weird, after replacing the sound of the m4, i noticed that m16 models still have the same vanilla sound.

And after looking around, none of the m16 folders in weapons_client have any sound folder where i can replace them

None of the IDF or the US variants of the m16 have any sound files or any sound folder inside them

Any idea of where the m16 variants may have their sound files? ( like the M16A1 "Mekotzar", etc)