Valve just made one of the biggest gameplay changes ever to Counter-Strike since the addition of the riot shield. As of today's update for Counter-Strike 2, Valve made it so that when you reload your weapon, you will drop the used magazine and discard all of its remaining ammo.
Previously, and this was the case for literal decades now, when you reloaded your weapons the ammo was just dumped back into a total "pool" of ammo. Sure, it wasn't realistic...


