WHAT DOES 5000 ROUNDS 9MM MEAN?

All those designations remain the same caliber, they just have better stress when fired (also called “hotter” rounds). These rounds can commonly be securely fired in most modern 9mm chambered firearms although.9mm ammo is also sometimes referred to as 9x19mm or 9mm Parabellum, which can be all interchangeable terms for a similar cartridge.$269.