[Rookie67]

Hi Muffin
according to series and weapon settings they use:

MG_59.wav
MG_59i.wav

mg_breda12.wav
mg_breda12x.wav

MG_68.wav
MG_68i.wav

preset files used by MC series:

weapon.MGunMG15120MGs.prs
weapon.MGunBredaSAFAT77s.prs
weapon.MGunBredaSAFAT127s.prs

Hope this helps

Rookie