[US_GRANT]

Ok, have you tried playing the .50 cal wave files (outside of the game) to see if they are in fact the .50 cal sounds and not the MG17 sounds?

Yep, sure did. Infact, I even went so far as to copy the 50 cal files and rename them MG17 and put them in to replace the MG17 already there and no effect. I'm stumped.