Instead of simply setting ammo counts to 9999 (which can confuse the game engine), the Extra Quality trainer uses a "No Ammo Consumption" script. Your magazine stays full when you fire, but the game thinks you are spending ammo, preventing the glitch where guns stop firing mid-mission.
The "Extra Quality" tag attached to the Black Ops Cold War trainer signifies a version that has been patched beyond the initial release. It accounts for the game’s Season 6 Reloaded updates, balances Zombies mode scripting, and ensures that invincibility frames don't conflict with narrative triggers. Instead of simply setting ammo counts to 9999