If you load an OOB then click on FILE then "Database check utilities" then do a search for the weapon you will usually find what you are looking for . In this case "quad" finds you weapon 61 and when you check the users of weapons 61 you will find it's used by unit 450 the M16.
So YES there are Quad-Fifties in the French OOB mounted on halftracks and available to beat off hordes of Viet Minh and since you did not specify how you wanted them mounted I can confidently say yes, they are in the OOB.
Here's some happyfaces
I wouldn't want anyone thinking that answer was "too harsh"
So.. were they available as ground mounts as well ??? If yes, I will add them.
Don