The .30 carbine was never produced with corrosive primers. However, the Communist Chinese did produce counterfeit Lake City (LC) that was corrosive and Berdan Primed.
All * USGI * .30Carb ammo has been non-corrosive from day one . And high degree of confidence for any USA mfg commercial ammo . Over the years plenty of ammo produced by/ for foreign Militaries , and never say never .